Pros
-professional packaging
-overall, the plastic quality is very good to excellent
-realistic and very G2-esque trailer... completes perfectly the look of my United G2 Optimus Prime
-big light-up sword reminiscing of the G2 Laser Prime sword
-bonus Drift sword
-extra sword blade (based on Drift's sword)
-parts attach easily and solidly
-different options: trailer mode, base mode, power-up mode, mech suit mode
-great headsculpt on the new head
-storage for all the parts in both modes EXCEPT Prime's original sword in mech suit mode, but I found out that you can store it on the backpack, so all is good
-I like how you can technically leave the guns pegged inside the trailer and just flip them around for the mech suite mode (but storing the forearms for trailer mode might prove more difficult if you leave them there)
Cons
-Mech suit makes the figure very back-heavy... you might want to tighten the hip ball joints with super glue to help with stability
-light-up effect is pretty useless as it doesn't light up the entire sword, just the bottom portion and not very brightly
-wire can be annoying and may eventually break over time if you're not careful
-new head looks too big when Prime is not wearing the mech suit
-I messed up the head installation by not reading the instructions... READ THEM.
-Mech suit arm assembly is a bit difficult to rotate during transformation, the plastic feels soft in that area and stuff is a bit in the way at the same time, but I can assure you it won't break, it just feels weird
-trailer doesn't turn freely in alt mode... the range is there, it's just that there's some interference between the truck and the trailer... it can be posed with the trailer turned though