Evaluating In-Home Care Providers

I'm trying to research in-home care options in Houston, Texas. We (family) have had experience with Home Instead and Sheltering Arms, and I've found online information on Home Care Assistance and Right At Home. I treat web sites with caution; though they may be informative, they are also marketing tools and may not provide an objective view. Please post here if you have had good or bad experience with in-home caregivers, especially regarding skills and cost. (Moderator: if this is not an appropriate discussion, please let me know. I would be happy to take individual discussions private if need be.)