I've had my 8.3 for nearly a month now and besides the rack I got on the day of purchase the only mods I've done are Ergon GC3's and a computer. I've been mostly riding on our decrepid farm land flat roads and have been on our community forest trail system once. The bike was the best fit when I was test driving them but having not been riding much in the past 20 years when I took it out for much longer runs, 5 to 10 miles, I started noticing the usual things, sore butt, uncomfortable hands ( the ergons help a bunch) and experimented with different seat heights. I was sure after a few weeks that I needed a new seat and was eyeing a Serfas dorado but didn't pull the trigger. I went on my longest ride yesterday, 16 miles and tried one thing different. I moved the seat back about a half inch and what a difference. No soreness at all in my rear end and the same for my hands. The bar ends really help to vary my grip. I had resisted moving the seat back as I thought it would put more pressure on my hands but there must have been something in the new geometry that just clicked. I'm glad I didn't run out and get a new seat to fix my sore but when it seems to be more of a fitment issue.I'll stick with the stock cheap Bontrager seat for now
I'll report back when I get some longer rides under my belt. This bike does great out on the open road and felt just fine in the forest as well!
It's amazing how much seemingly minor seat adjustments can do. I was having issues with my 8.3 with hand numbness and discovered I was sliding forward on the seat and the issue came from pushing back against that. I adjusted the seat more nose up and that issue was resolved, bit I had other issues with the amount of nose up.
I ended up trying a Brooks saddle, which I really enjoy and am glad I got, but it only slightly helped. For me the only solution was a two bolt seatpost. The single bolt that came with the bike didn't have fine enough tilt adjustment for my body on the bike. Knowing what I know now my issues could have been solved without the Brooks, but as I said I do like how it feels as well.