I love this jiskha service so far. It's been extremely helpful, however I was wondering if there were pay services that offered a little more.

Sometimes I don't get answers to homework problems I'm stuck on. I think it's harder to get help on some college level courses, for example.

tutorvista looks great on the surface. Could anyone recommend this service or maybe an alternative?

I'm not familiar with tutorvista, but I agree that it looks good on the surface. It also can provide the same tutor again at your request.

I have some experience with Tutor.com and found that the competency of the tutors varies quite a bit.

I suggest you try both services. Tutorvista promises a refund if you're not satisfied, while Tutor.com is free if you have a card for one of its participating public libraries. If not, it allows you to try 10 minutes for free.

Good luck.