Well, going against the advice of some people and with the advice of others I decided to put the 140 on. I already had a short stem at 60mm so the bike now feels faster and more playful. I didn't notice a major difference during ascents, but downhill I felt the fork soaking up lots of bumps. I've only done one ride, but I already feel like this has changed the feel of the bike. I didn't really feel like the fork was off balance from the rear shock, but maybe that's just because the trails I rode didn't need the rear as much as the front. I'm going to give it more rides, but just in terms of dork quality, I feel a massive difference upgrading from a Fox evolution to Fox factory. The trail mode is just much much better. I'm not concerned with breaking my frame because I don't plan on turning this into a DH bike. I'll do rough stuff, but I know the bikes limits.