I have one. I'm using it right now. I'm actually on my second one (a spare I bought in 2007). After about 12 years of heavy use I think the wires do start to break and it starts doing really weird things.

I could probably fix (or use it for parts) it which is why I put it in a drawer. Definitely feel like I get my money's worth out of them.

Yep, all this will tell you is if colors go well together...which really isn't that useful.

Now if it new the pattern and could augment it for a person for custom clothing, that would be really amazing.

It's normal for your heart to slow when sleeping, but if it's going really low you might not be getting enough blood flow / oxygen at night. If you don't wake up rested, or have issues exercising I would worry. Otherwise bring it up to your doctor at your next checkup.