I've thought about the T-Boss 550 many times, just don't know anyone that owns a Massimo for reference. I see mixed reviews.
Your profile says Collin County, so if you want to save some money, the warehouse in Garland has disply units for sale on ebay.
https://www.ebay.com/itm/2019-Like-New-MASSIMO-T-BOSS-410-UTV-DISPLAY-UNIT-4-5-miles-Winch-CAMO/264546544219?hash=item3d9833ea5b:g:LQkAAOSwTeJd3EhG
Dynamic Carts in Carrollton has some 200 carts that might be better for the kids. Similar to a golf cart with rear seats that convert to flatbed. Electric versions too if you want a quiet machine.
https://dynamiccarts.com/collections/gas-powered-carts/products/hulk-200-carbon-fiber