I have a 60 lb Belgian Mal/German Shepherd (3-4 yrs) who has separation anxiety. I started with a Gunner "intermediate" size kennel which is an amazing piece of kit. She's not a big dog but seemed to be cramped in the Gunner and couldn't turn around comfortably. Bad on me - they have an exchange policy, but it took some time to get her used to the kennel and figure out it was too small. Both the Gunner "large" and the Impact 40" (wide & tall) are the same price, but the Impact 40" is significantly larger. She has plenty of room now and is still not getting out.
1) We didn't notice this with the plastic Gunner floor but the Impact aluminum floor "sands" her pads down when she tries to dig out (which she'll never be able to do). One plus though, there were something on the Gunner door which split two of her claws (even with their metal door kit). All the edges on the Impact floor are "smooth" and she isn't cutting anything - even without the Impact door guard accessory.
2) She DESTROYED the bonus floor pad that came with it. Bummer - it was a really nice pad as a bonus, but we left it in there by accident one day and poof...
She is beginning to get used to the Impact crate and it is everything they claim. I'm confident she'll settle down over the long term and now I'm more comfortable leaving her in the crate - which helps my separation anxiety!