Oh sweet! I've used little tabletop ones at work, and ended up building myself one using the housing of some scrapped microwave equipment (it got hit by lightning so the circuits were junk, but the RF-gasketed housing was in great shape.) It worked but I never built many passthroughs for it.

The trouble with the tabletop ones is that it's such a pain to set up all the I/O passthroughs and stuff, often it's just not justifiable to go through the hassle, and it just doesn't get used.

Being able to walk in and just use your own hands to manipulate the DUT is huge. If you're not dealing with high power, it's plenty safe, and it just saves a ton of time.