I swapped the Blizzard 1260 twice before I had a full-working and stable card. The first 1260 was stable, but I couldn't turn the card of with the '2' key and the second one crashed everytime when I use FPU or 060 specific software. I had to wait 9 months to get an working card. It was made by DCE.
In 1994 I bought a Blizzard 1230IV (Phase 5). This card crashed every time, After swapping for another card, it works very well, even today.
In 1996 I wanted to buy Blizzard 1230 SCSI kit. My first doesn't like SCSI-2 devices, only SCSI-1 devices like Apple Power CD. In the end, I have two working SCSI-kits.
I think a Viper 1260/56 is a good value of money.