Anyone have a Fostech Echo AR II trigger? Impressions?

A buddy and I were talking about binary triggers just before Christmas, as a fun range toy.
We came across a site running a sale on the Fostech's, they were marked down and you could get an additional 20% off. The final prices without shipping was about $175 for the Echo 2 Sport, $300 for the Echo AR2.
The main differences I could see were the Sport had a paddle inside the trigger guard and was a pile of parts to assemble, and the Echo AR2 was a drop in trigger that you used the safety selector to go binary/echo.

So I decided to order the Echo 2 Sport, figuring to save a bit of cash. But they sent me the ARII instead

I've looked at some online reviews, videos where it seems fun enough. Curious what any owners think. I'm going to assume I got good value, if they'd been equal in price I definitely would have preferred the drop-in/safety selector option anyway.