Anyone used these regulators in their project?

Sparkfun are doing this all-in-one 5V regulator for $15, RS Electronics are doing it for under £5.

A similar looking version for £1.50 can be found on ebay.

And here's a 2 amp version.

Anyone tried the cheapo ebay ones out, looked at them in detail, anything to report? Are they safe?

Seem like a really great way to power your project from higher voltage over longer runs...

I've used Traco regulators in one project, not heavy use though, and only 0.5A versions
I think:

Don't know about the ebay ones.

Cheers, did they seem pretty reliable?