I see many xMart bike being ridden in the small towns I live near in South Carolina. Used everyday. If you can do basic maintenance, you can get a lot of mileage out of xMart bikes. And if something breaks that is major, just buy another. You aren't going to keep up with roadies nor handle tough mountain trails on them. But if you use it to ride with the kids or run errands in town, there is nothing wrong with an Xmart bike. I prefer Dick's Sporting Goods myself over xMART bikes myself but I have ridden a $58 Walmart Roadmaster from Columbia SC to Raliegh, NC before.
Walmart also has a good return policy on bicycles.
Regardless of what you ride, as long as you ridd it is what counts.
Cheers & Happy Miles,
BLake