I own Sako rifles but have no personal experience with the 75 varmint. However, generally speaking Sakos are of excellent quality, in my opinion boasting fit and finish among the very best of factory (non-custom) rifles.
Barrels are free-floated, and actions are properly sized to the cartridge rather than 'one-size-fits-all'. Accuracy is typically excellent, and the smoothness of the actions is unbeatable. As Jim Carmichael said in
The Modern Rifle (1975), "nobody ever had anything bad to say about a Sako". Really, there is nothing to criticize except the price, which is undeniably more than you will pay for a bog-standard rifle like a Remington or Ruger. But then, "buy quality, only cry once" as the saying goes.
Laminated / stainless combo is not my personal favourite but that's largely a subjective aspect. It will make for easy care and durability, that's for sure.
I believe the 75 Varmint has a set trigger? I have one on my 85 Bavarian, and like it very much.
Sakos have dovetailed receivers. You can use Sako's own Optilock system, which is good but not cheap. Alternatively there are a fairly wide number of aftermarket mounting systems available, including Talley, Burris, Millett, Leupold, Conetrol, etc.
This
Shooting Times review may be of interest.
Does the price for a brand new Sako seem reasonable?
Yes it does. Check on the Internet and you will see that the $1,050 asking price is fair. Of course, the rifle has been sitting there for at least a month, so try to haggle and you may be able to do better.
Are they worth the money they get for these guns?
You will have to decide that for yourself. As I said above, the fit and finish are outstanding. You can also count on very good resale value, if you later decide to sell. On the other hand, if you're simply looking for an accurate .223 bolt rifle, there are certainly cheaper options (e.g., Tikka and Savage).