My bro-in-law went to Raxx to get a HU, amp, subs and wiring installed in his 2 door Blazer a little while back. The install was simple, 2 JL 13W1's in a sealed box off a TMA 500/1 and an Alpine headunit.
We just took the system out because he sold the truck, and found some problems. Some of the wires on the HU adapter falling out. They also ran the power wire and rca's under the truck. The rca's were run down the side in wire loom, not damaged at all. But the power wire was run down the center, with wire loom, but it was touching the exhaust and melted straight through the jacket.
I would not recommend you getting anything installed from this store.