Concept is great, have more professional looking listings. My experience was the complete opposite.
I created a template and applied it to approximately 300 listings. There was an error in the code and the template was not being displayed. The rep could not fix it and during the first weekend I had 1/3 of the sales that I have been having.
After 5 days I removed the template which reverted all of my listings back to original text, changed all of the store categories on ALL of the listings, and removed my html coded table that was on about half of the listings.
I lost tremendous sales since this happened. Spent over 3 weeks getting my listings back to where they were before applying the template. Now over the last week my listing impressions have decreased 50% when they had been on a steady rise (~10% every couple of weeks since starting back in December) and I have approximately 200 more listings then when I applied their template.
If you're planning on using this service, DO NOT apply to all of your listings.
It also took me over a week to get a refund. Horrible, horrible experience.