I have used them since 2003, left them in 2010 for Interspire shopping cart which is more expensive, and whose customer service completely sucks, and their shopping cart is full of bugs.
Now that my year of customer service is expired for Interspire, I have to pay USD 250.00 to get my store fixed due to a bug in their script!
And they take 5 days to answer support, and only 5 minutes to answer sales when I contacted them about a possible upgrade.
I am going back to Ecommercetemplates.com, no bugs, easy to setup, no templates which lets you use any design you can find online, and integrate php includes easily which is what gave me a hard time in Interspire.
In short, go with Ecommercetemplates well worth for the USD 150.00, and don' bother with Interspire, they suck big time!