I would say for the $75 they are asking for the MRT. Just buy a used hybrid MyLaps on here.
Or you can even get a new 3 wire for only a few more bucks. Then you never have to worry if it will work with MyLaps system. Or when will MyLaps cut off the MRT's again.

PT's are the one and only thing in rc that you can buy and then resale and only
Lose a couple bucks on them.

I would just keep an eye in the FS section and grab a used hybrid.