I haven't. I have only the 30MB/s card and the 95MB/s card. So maybe the 45MB/s cards are fine. I can't say.
Be wary of the Lexar 90MB/s cards. That 90MB/s they advertise is read speed, not write speed.
Thanks for the reply!
Yeah, I saw in the link that pdyliacco posted that the Lexar and Sandisk cards in that speed range didn't fare very well. The Transcend actually got the top spot for coming in with a tested write speed of 60MB/s. Those even cost less than the Sony and Lexar. I'm just leery of their reliability.