I found that the aiptasia would disappear in to their hiding spot before the juice could do much more than singe a few tentacles. It worked great on aiptasia that were on flat surfaces, but in my tank that was probably 20 out of 2000 individual aiptasia. You need to really hold the probe up against the main body of the anemone for it to work, and I found that it was next to impossible to do that in my rockwork. The wand is also not the world's most maneuverable piece of equipment, so if they're under a ledge, or behind rocks, you won't be able to reach them (this might be something you could easily mod though).
My tank was nearly ready to be torn down due to my aiptasia problem though, so maybe my experience was indicative of it already being too far gone more than the device itself. I do know that I spent probably 5 hours total with the thing and I can confidently say that no more than 5 aiptasia were killed completely.
However, others have great success with them, so it might have just been me.
If you've only got 4 of them, I would take out the rock and blast them with a butane torch. If you miss with the zapper even a little, you could just be encouraging them to release thousands of clones in to the water. That's not a risk I would take again.
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