Personally I don't think JUST the TGV's are worth it.
If you did the whole kit and kaboodle like getting the phenolic spacers, port n polish n coat the intake manifold all at the same time with the deletes, then yes. It's an all day job hence the reason for doing all 3 things at once being worth it.
Also depends on who will do your TGV's and IM.... Some mate up better than others. PM me for a contact I have on IWSTI that does PnPnC on all this.
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold