I have a Specialized Expedition comfort bike, and I've been pretty happy with it. I commute (average about 18 miles round trip) and the fat tires make it great for rough roads and trails, too. I can't seem to go more than 50 miles without my knees going all funny....I don't know of that's the bike or just me, though, since one reason I took up biking again was because my knees were taking too much of a beating to keep hiking...