OP just means "Original Poster"...the one who started the thread.
From the testing I have done along with other's, the wrist straps on ANY standard zapper (excluding the Terminator 2) make it virtually useless. Just not enough skin contact to be effective.
Most of the zappers on the market are quite good, then there are others which are not so hot. I do not endorse any specific make/model, but definitely advise the use of handholds and/or footplates for zapping. It just simply works many, many times better than any wrist strap out there.