I got this as a Birthday present for a 4 year old boy. We also tested it at home for a week. My son is a big fan of cars and vehicles. He liked the car and really enjoyed how it transformed and the controls seemed to work well and the car was a speedy little thing. The size of the transformer is a standard remote control car size, it is not as big as some of the pictures make it out to be but my son enjoyed it nonetheless.
One issue is that it is fiddly to put back together. It is also hard to charge the battery, you have to take the battery out of the car using a phillips screwdriver and charge it externally with a little connector, after charging you would disconnect it from the connector and put it back into the car and use the Phillips screwdriver to close it up. It would be a big improvement if they would change the charging to be just a simple USB plug to the car instead.