It was between the trek 7.5 and the gt tachyon 3.0 when I was purchasing a bike a couple months ago. Those where the two bikes my LBS had in stock that were both similar to what i was looking for. Test rode them both extensively. I was leaning towards the tachyon simply because it was cheaper and growing up always had gt bmx bikes so i was typically familiar with gt quality. But I have to say after test riding them both I felt the trek just felt so much smoother and all around a more solid bike. They both had carbon forks and similar components but I ended up spending a little more on what I felt was a more solid feeling bike. But then again try all kinds of bikes go to every bike shop you can and test ride EVERYTHING!!! Before making my purchase I went to about 10 different bike shops and test rode everything from road bikes to mtbs Try to stay away from buying a bike online unless you test rode it first because you might not be fully satisfied at the end of the day.