I have owned two Magnum cards, both were 040s though. They both performed superbly for years. The first one I traded for a Blizzard 060 (sneakily done by Analogic, the price certainly didn't mention a trade-in). The last one I thought was knackered, but recently I dug it out, unseated the chips and scrubbed inside and out with a toothbrush and away it went! It's now installed in my 3rd best setup.
Things to note - (for the 040 version at least...)
PCMCIA works fine, I have an Alpha-Data CD-Rom controller attatched.
It may only take max 32MB Ram, double sided is OK, but only quite narrow ones.
It may need Magnum specific software.
