Review:
I like this truck better than the original mainly because I never see any other type here in europe.
Since it uses almost all parts It's a good value, perhaps the 3221 has a better colormatched trailer.
I wish all Lego sets had alternative sets planned, this seems like the lucky exception. Though all that is needed is some clever exchange of hidden parts and/or breakup of larger parts for other models. A 10x6 plate, two 12 long bricks and some sort of telephone booth (no phone) is left over together with the large sloped roof.
The total length is 41.5 studs compared to the original 49. I'd say less ridiculous, kids will cry.
My son soon overcame that the truck he built was gone and started to deliver goods to the toy store.
The trailer mechanism worked pretty good except in narrow turns, but was easy to hinge on and off.
It only broke down once, which is normal for a 3 year old. The main container was secured by replacing
some parts and I had to remove the motor grills from the roof to please the kid.
To compare, the original truck did not have a proper hinge mechanism either and had to be rebuilt once and again. The front bumper also fell easily so the durability did not suffer for the alternative model.
An extra handle found use to hold the box loader, a function missing in the original.
Internally it naturally loses the bed but the driver has coffee and a computer with delivery schedules easily available.
The roof became rigid enough to pull off easily, but it's secured with too many studs for a small kid.
Despite being one big part the original design was too stiff to hinge and frequently fell off instead.
Improvements? Lego should have included a 2x2 turning plate for the trailer (both original and alternative) I would also wish for some blank plates under the roof and smaller interlocking parts in the cab.
Even though I prefer this variant to the original I will rate them equal, because the alternative model increases it's value. Try it out and decide yourself.