When it came time to change out some of the older wood windows I had in my house 4 years ago, I decided to check out Mark's Windows & Vinyl Siding since I had seen their ads at quite a few houses in the neighborhood. I don't remember who the sales person was who came out at the time, but he was very personable and the company did a great job installing the windows.
Flash forward a few years later, and I received a call from Mark about finishing up the rest of the windows in the house. I had actually been thinking about finally doing that, so the timing was fortuitous. Once again I had the same great experience, and Mark constantly followed up to make sure everything went well. To top it all off, Mark is a great guy and I enjoyed talking to him about other things besides windows.
if you have a need to replace any windows, doors (I replaced my old french and sliding doors as well), or vinyl siding, I highly recommend using Mark's Windows & Vinyl Siding.