I am having problems with my Trek FX+ WSD. Yes, I have taken it to my authorized Trek dealer that sold me it, it is there now. I have felt that intermittently, the bike gives me resistance to pedaling, and/or the level of power assist provided at the various levels is inconsistent. Today I brought my bike in because it seemed to be not giving me that "kick" at level 3 and 4. The shop pointed out that the tires were low, but after pumping them up properly, it still didn't feel right. They test rode it and said they felt the assist, I agreed, but told them the assist was not up the level it HAD been at. This problem also happened 3-4 months ago, and they upgraded the software and the problem disappeared. Now I am thinking that the disappearance of the problem was just a coincidence, and the problem is really mechanical and not software related. I just have this gut feeling that the bike is not functioning consistently. I am going to call Trek on Monday to see what they have to say, but interested to hear about other people's experiences so I can alert my bike shop
One of the downsides to having a bike like this, is that there aren't a lot of them out there, this limits the amount of data that has been gathered on them, obviously, and it also means that your bike shop probably hasn't sold dozens of them. I live in the Bay Area, California, where there are lots of bikes and lots of money, the bike shop I go to is one of the more popular ones, and still, I learned today that only about 10 people had bought FX+ bikes. Whats frustrating is that I feel like because of the lack of experience, there are undiagnosed problems.
I am enjoying the bike when its working well, but sometimes I wish I had waited for all the bugs to be worked out.