I don't know why everyone goes with grips...
Because if sh*t happens, as it does, and your gloves get wet (for whatever reason), you can't just put on your spare pair and still have warm hands.
On the other hand (see what I did there?) if you change bikes frequently having gloves that can move between bikes is probably a benefit.
To answer the OPs question, my original grips eventually died on me. I replaced them with R&G heated grips and sung their praises for some time. That was until the grips wore out and they are now pretty much smooth. I've decided to get some Daytona heated grips, the version with the single push button controller that has 4 settings (instead of the more common one that has a dial type 3 position controller that does Low/High/Off.)
Linky to the auction on my watch list, they are pricey, but I just do some overtime and they are paid for. I hope it's a case of "you get what you paid for" with these.
I prefer to wire my grips via my fuse box, it has thicker wires than the stock wiring loom heated grip connection and is also switched. Thicker wires = less voltage drop = hotter grips.