Hi. I've shot several times now with the nanoFlash and had great results. The Media is more expensive than SDHC cards, but once configured, it works seamlessly when clicking start on the camera itself. Plus, you can record 35mbps on the camera itself (if so inclined). I have used a third party SDHC adaptor (Hoodman) for the camera and never had one issue. I can tell you that, at higher bit rates in 4:2:2, blacks are MUCH better; MUCH. Although I've been using it with an EX-1. Here's the link:
http://www.hoodmanusa.com/products.asp?dept=1063
The 350ex records onto S X S @ 35mbps, like the EX-1 and EX-3; not sure if the adaptor works on the 350, but it should, unless SONY did something to block the use of adaptor cards in the 350. (sorry if it isn't a workable solution; I'm not that familiar with the 350) Hope that helps.
Regards,
Joe