My opinion on justGG. The mod hits VERY well. I like the "flexibility inside" the mod. It's not just the outside look, but it's what's under the hood that takes part in impressing me. The bottom cap is a nice contrast to earlier, the ability to have all batteries hidden without tele showing when that's what you seek, the adjustable heights inside, etc. The connections hit really well. And the ac ring - it's nice to have one mod where you can just make a 2 finger adjustment. I'll add that the 510 lid is an awesome addition as well. But since I'm testing another Ithaka build on it, and HOPE to keep Ithaka on it, the 510 lid can go to an older GGTS since I don't have any GG adapters and won't use Chinese. I didn't care for the engraving direction, but it does grow on you....especially if Ithaka is on top. I DO love the fact that if the CT needs a clean out, it's a simple push of the insides and your ready to wipe it down.
Ok. The praises are done. but....BUT..... There is something to be said for the "old school" GGTS. For example, I look at my #605 and mount an atty, take a pull, and smile when THAT hits nice and hard. The older engravings and the direction of them, not as deep, but definitely more elegant, etc. Use in GG mode, carry the 510 lid from JGG over to use 510 mode and STILL hits hard.
JGG is a great mod.... I'm still old school. And I do still like the tele tube.