Is any fork worth it once you get to those costs? Compared to any fork of equivalent price, they easily stand up in comparison and is as good. They have some quirks, but are very robust stiff and a very good fork. I’ve got a lefty on my Cannondale Flash which i’ve had for two years now and have had no problems – I think its great. I have got into the habit of carrying out a bearing reset every two to three rides (5 minute job) and re-lube the needle bearings occasionally, so pretty low maintenance. It does have a different feel to normal forks. Its quite progressive and as you get to the full extent of its travel it gets quite firm. You can tune this out if you don’t like it pretty simply.
The only thing I think has not been through through well is the way the wheel attaches to the axel. You have to swing the brake caliper out of the way and use an allen key to unscrew the wheel off. Not a major problem, but it just would be nice if Cannondale had a neat mechanism to remove the wheel – like a Maxel quick release, and a clever lever actuated mechanism for swinging the caliper out of the way. But i’m just being picky – it really is only a minutes job to remove and re-attach the wheel.
I’d have one of the new Super Max Lefty’s on my Covert 29 over any other fork, but its pricey and 10mm too short in travel.