I got my 11 FP back in july and it was my first Yammie. I was itching to get it so I could just stare at it in awe, which is what I did. Although not as detailed as the other scales, I prefer my 11 to my 21 as IMO it looks better and of course is easier to transform.
Like all the other Yamatos, its best mode is the fighter which is sleek and has nice lines. My only gripes are that the tail fins are too small and for some reason the left shoulder plate sticks up The gerwalk mode is my personal favorite mode. There's no difficulty in posing it and no lack of balance, plus it looks really cool from certain angles. Battroid is generally nice looking but not very poseable. The head does sit a little far back but that can't be helped. the heatshield is kept on by 2 little tabs but I've found its easier just to place it on using double sided tape. The gunpod has a decent amount of detail and has a bayonet on the end of the barrel that can be flipped out. The fastpacks are a generally nice addition but the dorsal packs look somewhat undersized and cannot be seen properly in battroid.
Now for the main gripes: Bits of paint have chipped of the legs after numerous transformations plus on mine the shoulder joint on the left arm has come loose and I haven't found a remedy for that yet but I'm not too bothered either. Lastly the shield started to refuse to stay on in fighter mode. I fixed that by applying a bit of model glue to the plug of reshape the it without bonding it to the arm and it now fits snugly.
Overall it's a nice edition to your collection if like me you don't have the original version and is also a decent way to kick off your collection too if you don't already have any Yammies. You can images of mine at my model and figures page