I like it both ways. Having a great massage with nice jets is fantastic. But shutting off the jets and just soaking is very nice and relaxing as well. Many times after working out all the aches an pains with the jets, I'll turn them off and just enjoy the hot water. It's very tranquil.
Also when I have friends over, many times I find it's hard to have a conversation with the jets on high and since the tub is full, there isn't much "Sharing or moving of seat postions. so after a while, I'll turn the jets off.
I agree with Vlady to a point, not to get caught up in the number of jets, but rather the quality and the therapy the jets provide, but lets face it, all hot tubs, you can turn the jets completly off, so in light of this specific topic of turning the jets off, then it's moot.
I like multi speed pumps as welll as mulitple pumps. You can tune the massage a little bit better than with a single speed pump.