This set is a must-have to complete the trailer. It looks great and has a decent design. The weak point is that it is 3d printed so it had a "rough" feel to it. The peg are not holding as well as they should, and I really wish that they would have done something to snap the extensions (the "feet") in place as just by friction, they do not provide actual support to trailer when opened. I will most probably have to do some customization to have a pin hold it in place. I also had to sand the tab of the wheel covers as otherwise it was stressing the gap that it goes into. The Axe's tiny connector broke right away on me but some super glue seems to hold for now. But still, it does look great and makes a huge difference to complete this bare-bone trailer.

An excellent set that compliments the build quality of the A set. Besides an docking piece for the A set's Roller analog, the side supports are the best version of this feature I've had yet to see. The railing on the side gives it visual mask that both blends the supports and fills the negative space between Prime and the trailer's wheels. More so, the simple pull out feet makes using the supports easy and reliable. The Axe is the only weak point. It does has advertised, it mounts through the gap from his retracted hand and can rotate up and down for some posing options. But the mount is a bit tight and the blade comes off as less polished than the others. It's a small annoyance, but not a deal killer by any means, if you're looking for a way to spice up your ER Prime trailer, this is a great set to aim for.

I love this upgrade kit! Unfortunately the energon ax and a protective grille were delivered broken!

Awesome set. A must have.

The ZXB-01B that I ordered back in July finally arrived, and overall it's another big step towards making Earthrise Prime his best self. You have to unscrew the trailer wheel assemblies to get the fenders on, I almost lost a screw there. The Roller station is a very tight fit, contrasting with the trailer stands whose pegs are too loose - I'm not sure what to do about that, maybe a layer of paint? - but they look cool and otherwise work well. The gap fillers and radar dish for the autolauncher fit better than I expected though I did have to use force on one. The Energon Axe is actually a better design than the one in the Centurion Pack, though as a 3D-printed translucent object its material quality is lower - it's variably opaque and has something of a dusty finish. Still going to use it, it's built to fit onto the retracted hand stump instead of visibly containing the hand and has a swivel mount that lets it be posed better. Comes with an undocumented piece that lets you store the axe in the Combat Deck; as seen in the attached photo, if you arrange things right you can fit all the ZXB gear and the Centurion Pack ion blaster into the trailer and it will still close cleanly! Also undocumented is a small sticker sheet for the autolauncher cockpit canopy, which looks good but is unfortunately blue instead of gold. Overall, if people can afford the ZXB sets (and if they're available at any time, which is frankly less likely than having the money), I recommend them.