A bit of a thread revival, but back to the OP's questions I had a 109s on demo last week and took it to CYB on the Beast.
It's not light - we weighed it at about 28.5 lbs (with XTR pedals) but even being a bit of a weight weenie I can't say I noticed the weight at all when riding.
The (carbon) wheels were a revelation. They are incredibly stiff, track like they're on rails and don't really deflect in a "side" impact. I was worried about them given the cost, but I didn't really hold back at all. I noticed there were a couple of marks on the lacquer but they held up very well.
The riding position is great, (M, 5'10") and you can shift your weight around when needed. With the CTD shocks though, despite my scepticism I did what the shop suggested and left it in descend all day bar a couple of road sections. NO discernable pedal bob when climbing seated, and only a little out of the saddle. It's such a comfortable bike.
Gearing seemed high (er), noting the cadence of others compared to me as we were riding along in bottom gear, but perfectly manageable.
Climbing was interesting. Generally excellent, with good traction (even from the undernourished looking Ikons). I stopped on one rocky uphill section which was quite steep but then struggled to get the bike moving again. By the time I was clipping in the wheels just stopped rotating. Something to do with the wheelsize maybe as the section didn't look like it should have given me as many problems as it did.
Where the bike excelled was descending. For a 100mm bike it's very capable. It just seemed to hold and gain speed really easily. The Icon tyres didn't seem to like wet rock however. I'm no downhiller but some of the Strava section times were pretty respectable. At no point did I wish I had more travel, or feel underbiked.
The one thing I struggled with were low speed corners. The bike was slow to turn in and I kept having to put my foot down (and fall off).
Would I buy it? It's the only 29er I've ridden and was very impressed.
Slow speed cornering (I put that down to my lack of experience) and weight (though that's a mental thing) are the only two things I could hold against it. Oh, and the colour scheme, which I really don't like (the standard 109 looks much nicer).
Given that , the shop still has my 2k deposit so I guess I'm still thinking about it