I was probably unlucky but I bought a DKB Cobra years ago for my A1200 (around the mod 90's). I found it to be extremely flaky and particular with it's seating in the trap door slot. I would get a lot yellow screens on power on/reboot as well as random lock ups. Take the card out, all worked well (except I was stuck with a 020/2Meg 1200).
It eventually stopped working about 1-2 years ago so I recently bought a Blizzard 1230 off EBay and have had no problems at all, which was a realief since I always had a nigling worry that there was something wrong with the 1200 causing the problems. I am now planning on getting hold of some 3.1 ROMs to get 3.9 onto the machine now.
