I did change to a better seat. The shop said they would fix anything, too. I will use it to commute to work every day- and some trails on the weekends. I got a good bike for what I will use it for and at a pretty good price. Very light for its price.
Brakes work very well.
The rear derailleur works pretty good and is quite light. Great tires, and the rims are ok. The front derailleur is crap, and so is the front reflector. I broke the reflector running into a barb wire fence. The pedals are also very pooey and are plastic.