This place will attempt to RIP YOU OFF.
In a nutshell: I took our Pontiac in for a routine tune-up in which we had a coupon for, and afterwards they told us we needed ALL this work done, including new spark plugs (which weren't due for another 10,000 miles) and new rear struts! They quoted us $400 per strut ($800 total) plus $400 labor (on top of about $600 worth of other "stuff") and we were shocked, because our car never bounced or dipped excessively. So we left without getting the struts done, and instead went to the dealer so they could assess it -- and the dealer said it didn't need ANYTHING! And even if it did, for our specific car model, each strut would have costed just $125 each.
So basically, Tire Works tried to charge us for services and repairs we didn't need. If you go in to get work done, please be vigilant and have them explain every single process to you.