My new 2 year old Aussie broke out of his 1st cage 2x with ease, was in this one for about 3-4 hours and stayed in. So far so good. Only "complaint" I don't care for grated bottoms on cages but that's all you can really get with hardcore cages, and didn't want to spend 500$. Also the lock system; you would expect a lil more from sturiness from it considering how sturdy rest of cage is, but it looks like something that'll be easily broken. The support bar also makes no sense why not just weld that in like the rest of the bars. Over all tho it's sturdy, and I don't expect the aussie to get out of it anytime soon. If he does I'll try to update this review.