I got Q121 with extra storage and just as a heads up, they have an amazing support team but I found two issues are somewhat common. 

During checkout you may pay in full, get kicked to an invoice screen and be told that you owe another 10 cents or something really small. I'm not entirely sure but I think this is due to them updating pricing in real time or maybe I just have bad timing. Regardless, send the amount it says it owing to the same address, wait for a few confirmations, hit "Pay now!" and it will automatically set it up for you. 

I had an issue with my extra storage space as well. I had to run ``fdisk -l`` to check the storage on my VPS because it filled up so quickly and it was because I didn't get the extra storage I paid for. I contacted support, they reinstalled my VPS and it's been fine ever since. Should be noted that unlike some other VPS providers, they can't "Hot swap" storage or whatever you want to call it. They can't assign more storage live. They require a reinstall with the correct storage allocated.