You may have already figured out that mazdarx7engines gets their engines from Atkins rotary (I found out by reading the warranty they post on the website) which is mentioned often and has a marginal reputation in this forum.
My '95 lost a waterpump and 700 miles later (at 52750 miles) lost coolant containment so I'm shopping for a new engine. I was actually selling the car when I lost the engine and RX7 buyers are pretty savy (or should be) so I'm trying to balance the loss I'll take when I sell the care with a new engine against putting an engine in that scares away buyers. It sounds like the reman engine quality from Atkins, Mazda, Malloy and Hayes is all over the place and I'm nervous...