No, mine isnt the keychain one...rather its the clone of the mini DV80.

Here is a link of the cam I own.

http://www.xheli.com/72p-80-thumbcam.html

I havent had any issues with the memory card popping out.  But there are no buttons anywhere near it...so that is probably why.  And Ive used it on my 450 heli which vibrates 100x more than the planes I have had it on so far.

The only thing I dont like about it...is the date is wrong and i cant seem to change it.  Ive found countless links on the net that tells you how to change the timestamp, but it just doesnt work with my cam.  Other than that...its a great little cam and worth the money.