I have the 12U version of this cabinet and it’s worked out great so far. There was some cosmetic damage during shipping but I didn’t care enough to try exchanging it.
for mine i payed a couple hundred for my r410, about to get 2 r710's for around $50 USD. i also have a meraki MX firewall, MS switch, and an MR that i'll never use because i have my own AC wireless and that i got for free doing the CMNA training.
i have yet to get a rack yet but i already know which one i'm getting and with the cost of that it'll be about $850 USD for the whole setup (not including operating systems although i have 2012 and 2008 R2 from previous IT classes)
What's the dimensions on the 12U? Is it this one on Amazon? https://smile.amazon.com/gp/product/B0043WF9E8/