The free version is great but the paid plugins put it into another realm. The support is great with the majority of your questions already answered on the open forum (the only way to do a good helpdesk)eg I needed to link to a html file - first find in forum gave the answer.
Works as listed but I did find I didn't like the base price being posted to facebook (as opposed to the final price) and the inability to turn off showing the price. I emailed and also put a different request on their forum - both were answered in minutes. Very happy and a great time saver.