I have the Apollo 1260 (never had the Blizzard), but I can say the difference in speed between this and the 68030 (28Mhz) I had was very noticable. Combined with a Mediator you have a very usable system.
From memory the big difference between the Apollo and Blizzard was the SCSI controller on the Blizzard was usable. Otherwise I don't think there was a great deal to set them apart.
