Is HostKey GPU service provider worth a try?

Hi, I was trying to find cheaper GPU prices for hosting AI models. And I came across HostKey @ https://hostkey.com.

Has anyone used it? Does it have any caveats? Aren't those RTX A4000 / A5000 / A6000 cards really cheap for unlimited usage / month in range 285 USD to 415 USD?

I'd love to know your thoughts so that I can decide on renting one. :)