I can attest to the terrible sounds that come out of Lil' Rider products... I got my 2yo a car from this brand, the 'music' was so bad I cut the wires to the two buttons that triggered it.
And SLOOOOW, he regularly gets upset that he can't keep up with the neighbor kids on their Power Wheels brand cars, even when they're in slow gear. When the car moves slower than a 2 yo can walk... if they're anything like mine they get frustrated. modifiedpowerwheels.com can help you speed up a real one, including motor replacement/upgrade suggestions (I just killed a BUNCH of people's evenings with that site. Sorry wives!) BUT, this brand uses one motor with a non-standard gear so you would have to do a bit of re-engineering to make it faster. Battery life is pretty short too, even when properly charged.
Would i buy again? meh, it is cheaper than Power Wheels... but then again, it's cheaper in every way!