Saw these in the Ideal products catalog a few years ago. Now I'm seeing them at the Big Orange Box, and in distributor catalogs like Sunstar. Haven't gone out and bought any yet, just played with the package while waiting for some wire to be cut.

Is anybody using these on a regular basis? How are they for space and speed v. regular wirenuts?
How are they if you need to add/remove conductors? Do they have a release point like backwire receptacles?

We're still pretty much regular Buchanan / Ideal wirenut users at our shop - these look faster for initial installs, but if you can't easily modify (remove) them, then...

http://www.idealindustries.com/wt/IdcPushin.nsf

Thanks - happy New Year, BTW!