No, it's not worth 40 bucks to a combo amp guitar player.. It is a relabeled Sylvania longplate 12ax7 with less gain than other versions of the same tube that they made. Not all military 12ax7's are resistant to microphonics, and that longplate Sylvania tends to have problems. The GE longplate 12ax7 has a nice blues tone, and because of a thicker bottle is more resistant to microphonics in circuit and their 12axa/7025 tube is designed to be even more resistant to microphonics and might well sound better than the Chinese Mesa tubes, which are ruggedly built with triple micas to resist microphonics. Long plate tubes do tend to be more microphonic than their shortplate cousins.
High power combo amps tend to destroy their tubes because the speakers vibrate them around too much at high sound pressure levels. The vibration is a big factor in causing microphonic behavior, probably more so than the normal expansion and contraction of plates and grids caused by heating and cooling during startup and shutdown, the other major cause. That is why Jim Marshall favored design of his early amps as heads. One way to help this is to damp the combo amp cabinet by placing something massive on top. Some Mesa amps like my 2 12 Maverick have a chassis mounted screw that is designed to be jammed against the cabinet top inside face to help prevent the long chassis from shaking. Mesa shockmounts their chassis in some of their combo amps. Still another way is to place 2 or three layers of 1 inch heatshrink tubing over the V1 12ax7 tube's side from 1/3 to halfway up from the pins to where it starts to curve in at the top. The hotter the heatshrink gets in operation the more rubbery it becomes, and it still absorbs a lot of the tube's heat as well. The tube may run a little hotter but that is OK when compared to running cooler and shaking around more.
My 12ax7 collection garnered in over 200 ebay buying transactions is extensive in variety, and I have experience with nearly any one ever made, euro or American...as well as impressions of tonal qualities for each brand. Peace. 8)