I actually had a really good experience with the customer service here. I spilled coffee on my macbook pro so I ruined several things (optical drive, hard drive, top case, track pad). It was expensive to fix (about $650) but that was still way less than the cost of a new computer and it would have cost more had I gone to an Apple store (I was also told that sometimes Apple flat out refuses to deal with liquid damage). They saved me money by replacing my hard drive with a non-Apple one (it is not covered under Apple warranty, but if I have problems I can bring my laptop to Illni Tech Center and they wil fix it). The initial $69 diagnostic fee is waved if they have to repair your machine, so all I payed for were the repairs. They also migrated my data to the new hard drive at no extra charge. Also, I brought my computer in on Tuesday morning and it was ready for me by Thursday morning.
Another time I came in because my power cord stopped working. It was covered under Apple Care, so in a matter of minutes I walked out of the store with a functioning new power cord at no charge.
I would definitely recommend this place to a friend!