Good looking sleds, can't go wrong with the EFI for the little guys, if they roll it (and they might... LOL) you will thank god you bought an EFI. As a safety note, I don't see any tethers on those sleds - my advice ...PLEASE PLEASE PLEASE buy some and install them or have them installed. The Cat should be plug and play, the Polaris and the yammy might need to be wired, lots of guys have done this and can help with this I'm sure. The RMK has a lefty throttle and they have caused problems with the throttle cables on other sleds. Any sled IMO, but especially mountain sleds, should have them. If the sled rolls (can happen as much in the ditches on the flats as it can on the mountain) and the throttle sticks open, snow can pack in behind the lever as it flips on its lid and you now have a runaway. These sleds are far more powerful than we give them credit for. I'm not a safety Nazi but with kids on sleds its just never a sure thing and their lives are priceless and worth every penny of what you will spend on a tether. 25+ yrs on the hill, seen this happen too many times, lots of people get lucky, like this guy...full throttle sledding accident - YouTube