[Closed] pedal powermeters...any good

They are very good. But they are also still expensive. And MTB has lagged way, way behind Road (although this might be the year the gap begins to close).

Add Favero Assioma to your list. I'd look at DC Rainmaker's buyers' guide. I won't reproduce it, even in highlights, here.

Thanks. Dc rainmaker was my next port of call but wanted to suss out experiences too.

I thought that Assioma were the leaders? Both Garmin and Powermeter probably sold more over the years, but in terms of reliability I was under the impression that Assioma were the number one pedal based power meter these days.
I used to have the Uno, never missed a beat. Prices have gone up since I purchased mine (was a few years ago but don't recall paying more than £380).
DC Rain Maker is worth looking at, https://www.dcrainmaker.com/product-reviews/power-meters

I've since moved to 4iiii, fixed to the crank arm. I got it in a sale at about £250 so was a bargain.

I`d disagree that they are good. From our LBS I reckon twenty pairs of Garmin went to club members.
At least 80% ended up going to different systems or abandoning power meters after that.
two others went Assioma and both have been faultless so far.
As regards Stages, new ones seem to be "ok" but not great and the older heads that went Quark have been happiest.
Personally I have tried Avio, Stages, Powertap and Quark. If on rim brakes get an older powertap hub cheap for the win. Or Quark for best reliability and evenness of reading.
Around 250 in our club with a fairly large "fast group" meant a lot of sales went through the lbs.
If you absolutely must have pedals, then the only place I`d put my money is Assioma.

Father in law has the Garmin one (road), been faultless the 12 months he's had it.

Would describe his as a fair weather rider so it's not had the hardest life but he puts a lot of miles in.

One club member had at least four pairs of the latest Garmin before he threw in the towel and flogged them.

Garmin Vector 3 pedals are a bit problematic. I sold mine and bought Favero Assioma pedals. They are first class.

Assioma have been excellent, as have P1s. Garmin ran into troubles, but have a large market. My Assioma's were flawless for two years, then started losing charge. I'd buy one again.

I use an SRM on the trike for pedal aeroness now, but a Uno is on my other bikes (I swap it all the time).

Only asking as I'm looking to change the crank and I currently have a 4iiii which has been truly excellent and hasn't missed a beat in the time I've had it. Can go 4iiii again but thinking the opportunity to go pedal might be better to future proof against future kit changes. The Garmin and Powertap's look significantly more expensive than 4iiii but the Assioma doesn't look too much more than the 4iiii so might be worth the extra for the additional convenience.

It you look there are guides to converting Assioma’s to MTB cleats.

Or for the risk taker in you, take a punt on these. Cheap as chips and ready in 2025:

https://www.dcrainmaker.com/2020/05/iq2-power-meter-pedals-first-rides-testing-data-accuracy.html

Powertap P1 owner here. Bought new in August last year, they were sitting around my lbs. So far not as reliable as my nine year old powertap hub , but willing to give them a chance. When they work well they work, but sometimes the right pedal will go missing during a ride or workout then miraculously come back again.
My powertap hub and wheel is for sale btw.

You've changed the question. I'd stick with crank. The convenience difference between crank and pedals gets smaller the more you think about it.

I owned Quarq power crankset with the best ring option you could choose to put on it, but shifting was just never as good as Shimano rings and chainset so I sold it.

You can run shimano rings on quark. My partner has this on her race bike.

Ah if I’d known that I might have kept them. But good for others to know I guess!

You’ve changed the question. I’d stick with crank. The convenience difference between crank and pedals gets smaller the more you think about it.

Can't really stick with the crank as I'm looking to go to AXS so Shimano crank not compatible with AXS chain. Also current groupset will be transferred onto a 2nd bike I'm building. 4iiii do a crank arm pwoermeter for the Force crank arm but just considering the alternatives while I can.

Was aware of the issues with early pedal based systems when I got my 4iiii a couple of years ago so wondered if they have improved.

+1 for Assioma pedals, though mine needed a bearing change after riding through the biblical floods in Lancashire Jan/Feb this year. Only about £15 for new bearings

Having tested in comparison to the power meter inbuilt in my Drivo turbo, the assioma's have been 1 and 3watts for any steady effort up to about 400w. Mates have other crank based systems that are 20 or 30 watts different when compared to the turbo. Even accounting for error differences that's too much in my book!