I just transformed BB44 Optimus.
Even if everything is so small, the whole ensemble is definitely worth the leader price. The Optimus is perfect, the trailer is complex, there's tons of weapons, and everything looks great despite the usual missing colors and hollow bits.
The only time that I referred to the instructions was to know how to attach Prime's wings on his back (they don't tell you, figure it out yourself.) and where to store the weapons in the trailer.
All the transformation steps were easy to figure out, except how to transform the arms into the front part of the truck. That was a mind-bendre but it was very satisfying to figure out.
I don't know about other's copies, but the holes to store the big guns under my trailer were way too loose and had to be tighten up with super glue. That fixed the problem.
Overall I'm very happy with BB44 and it's well worth the money.
It will also be worth the money to get the upgrade kit and Reprolabels to make it even more perfect.