I had a Marin Mill Valley that had all kinds of handling quirks until it finally cracked. I think it was crooked when they welded it. Marin refused to warranty the frame, but sold me a new frame for a good price under a crash replacement program. The replacement frame handles marginally better.

Not learning my lesson, I recently bought a Marin hardtail MTB. I rode it around the parking lot and decided it would do. I forgot to consider the weight, I didn't even lift it up to see if it felt light. I later read somewhere that the medium is 35lbs, so my large is closer to 40lbs. Ugh. It's a tank, but the owner's manual is still full of weaselly text implying that if it cracks, it's my fault, carrying more than 25lbs of freight might void the warranty, and bodily injuries caused in a crash are not the result of any frame breakage that may have happened from the crash.

I believe lawyers have convinced Marin to make heavy overbuilt bikes as well as to dodge any responsibility for the bike's ability to withstand normal use.

I bought it anyway, so take my post with a grain of salt. Just read the warranty carefully before purchasing if such things matter to you.