Well, I don't know how much this will help since I use WOW for basic cable only (i.e. analog channels) plus internet service.
I'm very happy with both services. Customer service is excellent and I don't think the cable's been out more than once for the several years I've had them. Internet service has been out a few times, but never for more than a couple of hours.
I thought about getting the local HDTV channels from them, but it would end up costing me about $18/month more (with a CableCard, STB would be even more) since you need to get their digital cable package to get the HD locals and I really don't need more cable channels. and I'm not interested in the fancy HD channels (e.g. Discover HD).
(Worth noting is that Comcast appears to provide the local HD channels in the clear. But, I think Comcast is still more expensive.)
Anyway, I decided that I would first try getting my local HD channels OTA using the old antenna in the attic. I'm glad I did. It only cost me a few hours of work and $15 in coax (www.monoprice.com
is your friend) to get OTA HD.
I'm using a Sony DHG-HDD250 as a DVR to record OTA HD and my SD analog cable stuff. It has its quirks but so far is meeting my expectations.