New Style Single Speed Clamps?

Check out these nipple single speed clamps! This is what a normal single speed spacer kit looks like. This is for when you aren't running a whole cassette, and only want to run one gear:

The spacer kit

This is what it looks like in action:

Single speed conversion

   There are some options for different styles, for example this is a little more sleek looking:

2 piece spacer kit (with end cap)

   Enter Gear Clamp. These guys are building a clamping system to convert to a single speed:

Gear clamp system

   The verdict? In my opinion, it's a cool but overly complex answer to a solved problem. You'll get a tighter fit on your cog by using spacers and clamping from the end with the cap (from above). It seems like this would work its way loose frustratingly often. Someone write in and tell me why I'm wrong.