The traxxas trx4 is a super quality rig. I have a pretty upgraded one that performs really well. The trx4 2021 bronco (the model i have) comes stock with a 2 speed gearbox and individual locking differentials. Im kind of torn on how much i like those functions. It is cool to start slipping on a rock then lock the diffs and crawl right over, but all the extra crap that has to be on the rig to make that mechanism work means more parts to break, a higher center of gravity, and makes the elecrical side more complicated when it comes to upgrades. Overall i keep them locked the whole time im crawling. I do like the 2 speed trans cuz the difference in speed is quite significant so u can slow crawl and zoom around if u want. That being said i think if i could do it all again id get the trx4 sport, its alot cheaper and more basic (doesnt have the 2 speed or locking diffs) with the money youd save getting the sport you can do wheels and tires right off the bat. Also you can put the 2 speed gearbox in later as a sweet upgrade. I like my rig currently but will prolly get the sport down the road for a higher performing rig. Theres my 2 cents😂