This is the right time to get a TRF415MSXX MRE at more than a hundred bucks cheaper than it should be with the new release of TRF416... as Tamiya has made a terrible marketing nightmare of launching a new product (416) to kill off a older but proven product (415MSXXMRE) at the same time.
There is no major major changes between the 416 vs 415. Personally I will still go for a TRF415MSXX MRE