I've been playing for 47 years now as both a semi-pro and amateur/hobbyist, and a lot of great instruments have passed though my hands over the years. This is one of them. If you have some basic knowledge of how to properly setup, care for, and modify guitars there is no reason you couldn't have a Les Paul every bit as good as the real thing. For me, the only modifications I've made was to 1) swap out the tuners as they had a tendency to not immediately catch or engage at times, and 2) put on an Earvana Compensating Nut (which I automatically do to ALL my guitars). There was nothing wrong with the intonation and, in fact, the intonation was perfectly setup right out of the box! However, I mostly play around the first 4 frets where intonation is problematic on ANY guitar (even $20,000 ones!) and the Earvana solves that problem. Regardless of the "catching" problem, the tuners did work and the guitar had no problems staying in tune. I choose to replace the tuners with the Wilkinson EZ-LOK tuners which retail for about $20 USD and work great, so it hasn't proven to be a deal-breaker.
The fit and finish are simply flawless! This is a beautiful looking instrument. My "gold" top is actually a little more on the copper side (too much red pigment?), but I've come to really like it this way. It still looks fantastic and it makes mine unique (I hope)!
As far as the neck and frets go: I see no issues whatsoever with the neck or frets. Frets are smooth and polished with no sharp ends. The neck feels and plays simply great. for those concerned about neck-dive, this model is well-balanced and there is no neck-dive with it. One thing I especially like about the neck is that the headstock is at a 14° angle like the Epiphones and not 17° like the Gibsons. This means there's less (unnecessary) tension on the neck/headstock so that the neck is more resistant to breaking while still providing all the tension you need. Why Gibson continues to use a 17° is beyond me as it's completely unnecessary and only weakens the neck. The SC-450 also has a scarf joint which aids GREATLY in preventing neck breakage. Yes, I like scarf joints and you should too. Nice touch, Thomann!
The inlays are perfect and centered. The bindings are perfect with no gaps or marring.
The weight is pretty hefty although not as heavy as an actual Les Paul.
The electronics, knobs, and switches are all solid and there are no problems there. The P90 pickups, which is WHY I got this particular gold top model are simply luscious! Nice beefy sound with a nice tonal range. Everything you'd want in a classic P90. If you know P90s you either love them or hate them. I love P90s and the Roswells are outstanding. Yes, they're a bit noisy, but that's all P90s (which is why some people hate them). You learn to deal with the hum because nothing else sounds like a P90. This thing grinds/rocks like a champion!
The bridge and tailpiece are solid and I see no problems there.
This guitar just smacks of amazingly good quality and craftsmanship and it astounds me as to how Thomann can do this for so little money! This is my first experience with an Harley Benton Les Paul and based on this I will be buying more HB Les Pauls. Right now I'm looking at that beautiful white one!