While I prefer to stick with know brands, mostly SanDisk, I would think that anything that complies with the CF specification would work.

The only unknown would be transfer speed. Nothing on their data sheets indicates a rated speed, which suggests it's not design for high speed/bursts.

The first thing I would do is to set my camera on fast burst and see how many shots I can get before the buffer fills. Then I'd fill up a card and see how long it takes to download with my card reader. These would tell me the limits, how it compares to a known card, and whether I should be concerned while shooting (mostly applicable to sports/action shooting).

What did you mean when you say your cards are getting a little full? Any camera memory card is meant for short-term storage until you can download them to a PC for permanent storage. They are then cleared/formatted and re-used. Are you intending to use CF cards as your only/long-term storage of all your images?