My son has one from PlaySkool. The traction wasn't too good and the wheels dont't exact roll properly. But this one can be converted into a sit-on car which he plays with now that he can walk properly.
When he was just beginning to walk, we had to hold onto the push walker to make sure it doesn't go too fast. In the end, we gave him a stool to use as a starter push walker. When he was more steady, then he used back the PlaySkool push walker.
I think at the end, the traction and speed control is the most important. So that your child can control it and not fall face down on the floor. It's good that TOMY brand allows you to adjust that.
I still didn't regret getting the PlaySkool one because it is not wasted. My son still uses it as a "car".
There's another push walker by Fisher Price, which is a shopping cart. My son uses that at the infant care but the problem is the same. Doesn't allow parents to control the wheel speed. But, in the end, we can use it to store toys. LOL.