@Scuba Steve Tokes the big difference between the Terp Torch and the Herborizer or other 'end game" vaporizers is refinement.
With the Herbo for exemple it's gonna be easier to use since it's smaller, the heating of the herb will be more constant, better taste of the vapor, the design of the vape looks a lot better.
The one place where the Terp Torch will match the Herbo is on the potency of the vapor, it will kick your ass just like the vapor from the Herbo would.
The TT will require to keep a close eye on the herb to avoid combustion and will need more work to ensure an even roasting of the herb by rotating the vape but the end results is still gonna be monster clouds.
In the end, the power of the Terp Torch and the low price makes it a really good purchase for someone looking to get an introduction on desktop vapes. In your case you already have a Plenty for a desktop but the TT will need a lot less herb to give you the same results.
If you plan on getting a couple of different vapes I don't think you'll regret buying the TT, there's not a lot of vapes at that price range that can make me tap out as quick as this one does. And when you finally get an "end game vape" you'll really appreciate the upgrade of the experience and the vapor quality with the new vape.
Also you can still keep the TT as a back up or if you need a small desktop for travel.
As for using the Terp Torch with hydratubes, I'm not sure it's worth it, it's gonna be a lot more simpler to use a regular water pipe. I'm sure it's possible to make it work with adapters but the TT is already tall as it is, now add on top of it the bowl and the hydratube, you are gonna end up with something that won't be practical at all.
When you'll get your water pipe just make sure that the glass connection looks solid since the TT is tall and you'll need to rotate it in the bowl, this could put some stress on the glass and break something.