I've bought stuff on a couple of occasions. First was an OME suspension system (leaf springs, shackles, bushings, shocks, steering stabilizer). Since they didn't normally stock the parts, I had to pay ARB retail minus 10% since I bought the entire system. Malcom did the install. It took them all day, though. The rear lifted up so much (previously was sagging badly) that the driveline angles were out of whack. I had to return the following week and have the rear springs shimmed w/ 2.5 deg wedges), which brought it to about 1 deg off. Their labor prices are steep...$75/hr, I seem to recall, and I got charged even during the times when the mechanic was distracted by another customer.
Second time, I ordered a Kaymar bumper/carrier (listed in their catalog but not in stock for a 1st gen 4runner; I think I'm the first person to buy one, maybe in this country [bumper is exactly like the 78 series bumper in the Kaymar catalog, not like the hilux bumper]). They happened to be placing an order w/ Kaymar that week, so the due date was about 1 month by ship from Oz. Just about when it was expected to arrive, the LA Port shipping strike occured, so the bumper sat on a ship somewhere within view of my living room (I could see the ships anchored offshore from my old apt) for 2 months. I drove there and picked it up, installed it myself w/ no issues.
In retrospect, if I were to have any work done, I'd have Malcom do it...he's the most senior mechanic there and very cruiser knowledgeable. The guy I dealt with for ordering was Scott...seemed pretty knowledgeable, but doesn't get his hands dirty in the back. If I were buying an OME system today, since I have a lot more experience working on my rig, I'd do the install myself. Christos' instructions are written well...light years better than instructions by ARB/Kaymar (no pics, vague).
The MAF price on the OME 2" lift kit (basic kit) seems reasonable (older price). I haven't checked the current prices, but in the older catalog, for some weird reason, it was cheaper to buy the basic kit, then the caster bushings and steering stab. separately than to buy the medium-grade kit containing the caster bushings and stabilizer!