The racket hasn't been as loud from Ireland as it has from elsewhere, especially the UK. I suspect this is because FindMyPast Ireland and Australia/NZ (and possibly the USA, which I've never tried out) have being using a localised or similar version of this new engine since their launches, so we might be finding the leap somewhat narrower than others. That doesn't mean we're happy bunnies, of course. I've always preferred to use the UK site when searching FMP's Ireland collection; that option is no longer available because all the FindMyPast sites have moved to the new engine.
FindMyPast has responded to the criticisms with a couple of videos. The first is an interview with the editor of Who Do You Think You Are? magazine where the company replies to some of the criticisms; below it is a how-to tutorial which may make the jump a little easier. Both can be viewed below.