There are only a couple of reviews at this time but that will increase as more buyers become aware of SIP productivity benefits while saving valuable water and time.
It's time to order seeds and check out SIPs if you haven't already. There is a ton of information, including consumer experience, on this site. Just surf the categories in the right column or use the Google site search (upper left).
If that fails to answer your question, post a comment. If I don't know the answer I know where to find it. I research every day of the week. It's my positive addiction.