a)the reviews I have read
b)the high level of service I received when I had some initial problems in the early part of the installation (which were probably caused by me anyway)
It almost never occurs that bad products are supported by great service! And great service will always ensure that problems when they arise will be addressed asap anyway.
I was motivated to post this review even before I had fully installed the product as I have just been so impressed by Shawn and Helix's very responsive and pro-active support.
They have also obviously put a lot of time into the User Manual which is appreciated as often documentation for extensions is a bit "on the light side".
Thank you OSE!