do a search... I know this company has been discussed a fair amount before.
I bought a wheel and tire package from them, and haven't had any complaints. But beware that if you do have a problem, there is a pretty good chance that they won't be much help.
and decide for yourself if you want to take the risk.
"Based on BBB files this company has an unsatisfactory record. Specifically our files show a pattern of failure to eliminate basic cause of complaints regarding refunds as promised and a pattern of no replies to customer complaints brought to its attention by the Bureau."
As far as the quality of their products, they sell different brands, so I'm sure the quality varies, but the Exel brand is apparently a house brand that they manufacture themselves. That makes for attractive prices, and the quality seems to be decent. You can get different brands of tires, you just have to ask.