I've just sold an Amiga Technologies 1241 Q-drive on eBay. The item description and photos were detailed, with the item description being copied word-for-word from the back of the box, so it may be of some use to you:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=3067317034&category=3543&rd=1Obviously it's different from the Squirrel SCSI, because you can't add additional devices, but it worked really well, and was 99.9% CD32 compatible. Fast transfer rates and no stability problems... I've had personal experience of Squirrels overheating and freezing A1200's. Perhaps someone else can tell you more about Squirrels, though, since I didn't use one for long.
Steve.
[EDIT]
More information on the Q-Drive 1241 here:
A1200 Q-Drive 1241 Brochure - FrontA1200 Q-Drive 1241 Brochure - Back
