I first bought a second hand Gordon SMith GS1 about 25 years ago, it was a 1980 manufactured guitar and was a bit beat up but one thing in it's favour was the sustain of the wood. It would last for ever. I was unhappy with the sharp edges on the guitar as most of my playing is seated and it cut the hell out of me so I stripped it down and 'Womanised' it, giving it nice soft curve edges.
I opted to install a Kent Armstrong HRE-1 PU, after talking with the man himself, in place of the stock GS PU of which I had no qualms with but I love the edge that the KA's have. I held onto this for years while also acquiring a top of the range GS Geminii that was out of this world. I sold the GS1 to a mate at a later date and regretted it as soon as I did so.
The Geminii was just incredible with tone and sustain and the wine stained bookmatched flamed maple was perfect. Unhappily, divorce forced the sale of this.
A little bit later I got the chance to obtain a maple clad Honeyburst GS Classic T and although I have never been a fan of fender shaped things it took a while to like this but after a pro set up it grew on me and gave twangier twangs that a telecaster.
Along came a GS1 12 string at a price that would have been stupid to refuse and it ended up in my guitar stack. This again got a Kent Armstrong HRE-1 fitted to it and sounds just right.
The latest is that I have just bought back my original GS1 from the mate I sold it to at a slightly inflated price but well worth it. It is going to get a respray from me as it has been gigged hard but is still in prime condition.
So, as far as GS quality goes - the GS1s are base level guitars and made to work for years and they do. The higher end guitars such as the Geminii and the Classic T are just that, high end. Excellent build quality, great wood choices and excellent finishes. You would not get a geminii the likes of that I owned for anything less than 1,750 when the originals marketed around 600.
All in all, I would have a Gordon Smith before anything else but then I'm not biased, just lucky with the ones that I have owned