I had the Sandisk - it died after about 9 months. This is consistent with the crappy quality of their CF Flash memory cards, I guess. I\'d say stay away.
The Ambicom seems popular with those who own them (I haven\'t tried it), and it\'s very reasonably priced, if a bit hard to find.
I have a Socket low-power. The range is a bit low and it is (or was, at least) a bit pricey, but it is plug-and-play in every ROM I\'ve tried.