I got this for my son, now that he has graduated from 'little Ben 10' to 'Big Ben 10'.
I must say I think the makers firstly have thought more about making money, than your child having fun. With the old one, you had many sound effects and could chose to be any of the aliens. With the new one, you have to buy all the action figures to get the small alien figure so that you can attach it to the watch. In reality, even if you cough up the money and buy these figures..(I bought 5 of them) you can't expect a five year old to run around with all these pieces, that also are quite hard to put on without fear of breaking something...even for an adult. So in reality your child will not really bother with the attachable figures when playing...another part that they missed from the old Omnitrix, is that after a minute or so the Omnitrix would make the sound effect of timing out, which is when Ben would turn back to a normal boy..usually at a moment in battle and would say "Oh Man"...which my boy used to mimic, before trying to scurry off and set the dial to become an Alien again. This new one has no such function.
At the end of the day, it has very limited sound, a very bad strap, and a stupid alien system purely designed to make money.
They really could have tried harder.