Cup holder mount

I have never used any one of those products before, the phone holder clamp looks well built and secure but the cup holder part looks a little unsecured, with the phone mounted it looks like it might be top heavy and may flip out, i may be totally wrong tho, iam just going off of pure speculation of how it looks. i personally am using the same phone clamp style but it mounts to the AC vents.
plus (not knowing the design of you vehicle) a cup holder mount would require you too be looking down a lot
 
looks like it could work for a lot of phone designs. as for it being securely in the cup-holder, the first one looks like it's got grips on it, i guess it depends on the size of your cup-holder.
 
I had one similar (if not the same) as the 1st link for my old XM unit and never had an issue. Matter of fact I may have to see if i still have it for the Droid... :)