Go for it. The GX is the ultimate 1-body, 1-lens "do (almost) everything" camera. It will be your companion for life. Any price under 2k€ is very good - so good that there might be a catch. Be aware of it and get your hands on it and inspect it thoroughly before buying. If all it needs is a CLA, it still makes it a valuable offer I think.
I spent over 10 years shooting with only one camera, a 2.8 FX. A few years ago I found a GX and added this to the collection. The GX and FX are virtually the same except for 1) cosmetics, 2) the FX has the "old style" scissor strap attachment whereas the GX has more standard strap attachments, 3) there are variants in the shutter but all are good. My FX and my GX turn the shutter in the opposite direction, for instance.
The GX (or FX, for that matter) is often decried as a lesser Rolleiflex, usually by those who never got their hands on one. Sometimes you even see claims that it's made of plastic - which could not be further from the truth. The GX is as sturdy, well built and durable as any Rolleiflex A/B/C/D/E/F. (And yes, I have a 2.8E for direct comparison!) In my opinion a GX is even more durable: they have been produced in the 90's, have less mileage, and are unlikely to have been abused by press or wedding photographers.
The winding mechanism is derived from the T, which to me is a real advantage over earlier 'Flexes. No more film start sensor to go out of adjustment. It is much more reliable. And again, no it's not made of plastic.
The built-in light meter is very accurate and a blessing in the field. The field of measurement is close to spot. In 10 years of shooting I can barely remember of any wrongly exposed picture (and then it was due to user error). Having an integrated meter is always great in a lightweight setup like the Rolleiflex. One thing less to carry!
The lens is the best 80mm you can get on any Rolleiflex. Period. Multicoatings are a definite improvement over earlier Rolleis, unless of course you want a more vintage look in your pictures.
Bay iii filters can still be sourced new from Heliopan.
The only thing which could be missing is the self-shutter. I missed it a couple of times, but eventually decided I can live without. My Hasselblad does not have it either.
If you have specific questions, feel free to send them over. If you are near Munich at some point I'd be happy to show you mine and discuss over a beer.