Okay, I found one of these and have been playing with it for a bit and here's my take on it.
First, THIS THING IS A BEAST!!!!!
I mean really, it's HUGE!
Take the lowly A500 and stick this on top of it, and you've suddenly doubled the depth. With the BB attached, the A500 is a whopping 23 inches deep instead of the typical 12 inches.
The height is also monstrous. In the corner computer desk I use for the "Amiga Corner", with a 15" LCD monitor, I have about 1/4" to spare! Much taller than an A2000.
About the only advantage to this thing is the zorro slots with the ability to add a bridgeboard. However, even that's not a big advantage due to the GVP 286 board for their sidecar peripheral or the ATOnce card that fits where the processor is in the 500.
All in all, I can confirm why this thing didn't sell real well. Way too bulky.
Of course, that's just my 2 cents.
Curtis
Counterpoint: when the 500 was new, it was the only way to get Zorro slots (video card, SCSI controllers and bays for multiple HDs, etc.) on the 500. Continuing to stack out towards the left to add things on was tedious.
Other cons, though?
No CPU slot
No dedicated video slot
Not 100% compatible with internal 500 add-ons (some accelerators, some RAM expansions)
