The problem (as I see it) with back-stabbing receptacles is the "cascading" from one to another (pair in-pair out & not from a pig-tailed splice). If you have (let's say) 8 receptacles on a cascaded run and begin plugging in appliances down stream of the first one, that first receptacle is taking the heat for all beyond it. From my experience that first receptacle is usually the one where the problem arises. However, even though I choose not to back-stab, I see no problem back-stabbing from a pig-tailed splice. At least that way any problem that may arise is localized to that device because I believe a properly twisted, wire nutted splice is a stronger connection than a cascaded receptacle. AND we all know that HO's are going to stop at HD and pick up a few 12 amp heaters and plug them in wherever they see a receptacle. Back-stabbed receptacles are not going to hold up to high amperage draw appliances (at least not for long).
Another problem I have with back-stabbing receptacles is that this wiring method is done strictly for speed wiring and to save $$ on labor. I usually find this wiring method done in track-built homes. That electrician is getting the same $$ for 100 units so he tries to find ways to make up a few $$ wherever he can. When you buy a receptacle the screws on the receptacle are all the way out. You get to the outlet position, strip the wires, stab them in, screw the receptacle in, put the cover plate on - done in less than 1 minute (never touching the screws on the device).
If stabbing is such a great and revolutionary wiring method you have to ask yourself :
- Why don't they make receptacles where you can back-stab the EGC ?
- Why do you have to crimp or splice the EGC together before connecting it to the receptacle?
- Why don't they make receptacles so that EGC's can be cascaded as as well ?
- Why do they no longer make receptacles that accept # 12 wiring in the back-stab ports ?
- If you're working for a track builder did you take the job for so few $$ that back-stabbing is going to save you that much $$ ?
Sorry to drone on so long.
Being honest - no I wouldn't use the back-stab method in my home or anyone else's for that matter.