Rating: - do not buy this for a R4 card
This card does not work in R4 cards trust me the one i bought didn't

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Rating: - Works with the HTC-S710
I've uploaded a couple of photos of what I received from Amazon on 2-Aug-2008; the microSDHC card and SD adapter.

The card works with my HTC-S710 Windows Mobile Smartphone.

It amazes me that such a tiny card can hold so much data and cost so little. It's so small that it isn't something I want to take out and put back into my phone on a regular basis because it is so fiddly to handle; I'll leave the data transferring to Bluetooth.

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Rating: - Not compatible with Garmin Edge 705
I bought this on an Amazon recommendation and when I received it (very promptly) discovered it was totally not compatible with Garmin Edge 705. Luckily, it does work with my mp3 player.

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Rating: - Was ok, but didn't last long
Does what it said on the tin. Useful little USB adaptor. Problem is I can't read / delete from it any more, as if it's locked in some way. Can still read files from it though.

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Rating: - Product description is incorrect
The card is fine, works as intended and I will be keeping it.

However potential buyers should be aware of a couple of things
1) The product description on Amazon is wrong. It states "SanDisk microSDHC 4GB card ships with Bonus MicroMate USB 2.0 SD/SDHC Reader" .... it doesn't come with this, only a microSDHC to SDHC adapter so you will need a card reader that supports SDHC cards to use it with your PC.
2) Its not supplied by Amazon, but by Indigostarfish, so in my case "1st class" delivery took 5 working days (you are advised of this when you order to be fair).