@matrix
I got a similar situation where I am. I have a choice between my current very reliable provider, or the new guy that on paper provides much better upload speeds (same download), for the same money, but they're known for having horrible customer service. I denied this other ISP 2 times now. I preferred the reliability, since I don't really need the upload boost.
If you do need the speed boost, then maybe it could be a risk worth taking for you, but for me, it hasn't been worth it so far.