Exactly! Ive just had mine done at center mavity in atherstone, the test drive after was also a great experiance, chris has driven many many s2000s and he showed me just what I had been missing out on by a very very poor (dangerous!) previous geometry alignment and repair (previous owner kerbed it and it was taken to a HONDA garage for repair/alignment, who promptly put the adjustment washers the wrong way round and set the car up to what chris said was an extremely dangerous unstable setting, cambers on both rear wheels were at the opposite end of tolerances and one was hugely outside spec, he said he could have done a lot better just by eye). The test drive let him check the car for me, and since I had no idea how much different the car would handle, let him guide me into the new settings and also make sure the car behaves properly.
I wouldn't ever consider taking it anywhere else now, you get free reign of the office/workshop and see up close everything thats being done, the level of service there is second to none, which is why people with s2000s/porches/ferraris rarely ever take their cars elsewhere after having been there!
Imo any alignment center that doesn't allow you to see what they are doing, test the car for safety after making huge adjustments to the way it handles are doing a very poor service indeed. Although If you are taking an ordinary car then I guess this wouldn't really be needed, but there is always the 1 time out of 100 where something is wrong that a machine cannot check for! Safety first etc!