I ordered 2 from Luna Park at the same time. One arrived yesterday. I hope the other will be delivered soon. I'm surprised they weren't shipped together and hope they didn't misread my order.
There were no obvious issues with my unit, so I feel lucky for that. We'll see if my luck holds out for the 2nd unit yet to arrive. I only opened my 1st up to check and did not transform.
These are my brief initial thoughts, now that I've had it in hand:
It's heavy, which gives it a feel of quality. The colors and tampo printing and quality of plastic are nice. But, being partial to fighter-mode, I cannot get over the big belly and huge thrusters on this thing. It's like the front half is 1/60 scale and the rear half is 1/48. A Bandai 1/60 VF-31 pilot could practically stand fully erect inside the thruster of the Bandai YF-21.
My opinion is that the beefy legs were not worth this fighter-mode at all. Especially, since the beefy legs appear to be the only 'improvement' over the Yamato YF-21. Even the arms are obvious in fighter-mode just like Yamato's. Bandai had the opportunity to do great things with the YF-21, especially with the ability to learn from Yamato's version of it. They did not do great things, IMO.
I will probably sell my Bandai 21's and continue to enjoy my Yamato 21 and 22's. The legs don't bother me. Taking the line art out of the equation (not that Bandai did a good job of following it anyways), my head-cannon continues to tell me that the Yamato legs are more believable anyways considering they don't provide any use at all in fighter mode and only add weight. In battroid-mode the legs don't really need to be beefy either since they are not used for thruster vectoring and it's not like the YF-21 especially needs the ability to walk around. It's just fine jumping around with its thruster backpack and using it's legs like a mosquito.
Maybe, someday, Arcadia will improve upon the Yamato design.