Hi, Rocky - I haven't heard of this particular company before. Beyond that, we generally don't comment on competitors' programs. You may want to ask your question on a GMAT-related forum that is not tied to a particular company in order to get broader feedback, as a lot of the people here are in our programs or using our materials.
An excellent non-company-affiliated site is Beat The GMAT (
http://www.beatthegmat.com). That site is "test prep agnostic" - that is, it doesn't belong to any test prep companies. It's just a non-profit site with all kinds of GMAT resources. You might have better luck finding people there who have used the company you mentioned.
Though, having said that, if anyone has used WinGMAT, please help Rocky out by providing your thoughts!