Don't check them out just yet. I have experience with Eurotubes and JJ's. They are good tubes for a good price. The customer service is fantastic! However, if you want your Rectifier to to be the best it can possibly be this is what you do.
Go to GrooveTubes.com.
Order two 12AX7-C preamp tubes for V1 and V2
Order one SAG-AX7-MPI for V5
That's it. You do NOT need to order any power tubes or rectifier tubes. If you REALLY want to you can order another 12AX7-C for V3. But that's it. I swear to you this is the best thing you can do. I know, because I did this. I ordered the Hi-gain kit from Eurotubes. I put them in my Dual Rectifer. It was "ok". I'm not knocking them. But when I put in those Groove Tubes, BEAUTIFUL!! I then ordered the Marshall High-gain Kit from Groove Tubes and put them in my Stiletto. It blew away the hi-gain kit from Eurotubes. In fact, I had to take the JJ's out because it was hissing, and I lost all sensitivity to the knobs. Don't fall into the JJ's hype as being the end all tube. There are other and better things out there. Let me know how it goes.