They really are very good indeed for the money, though there are also some people on ebay looking well over the odds for them. I think I know which one you got and it did look like a decent scope but was right at the top end of realistic money for them so glad it is good quality and working well for you. There is still one on there at nearly twice sensible money for the scope, plus the seller makes no comment at all about the glass in the advert so I suspect you got the better of the two. For a while there were lots of them, and Nickels, on ebay but there are not so many about at present.
I've a sort of passing interest in them and have a 30X60 Optolyth and the truth is that the Optolyth would have cost a lot more cash and not really given much advantage in normal "spotting scope" use so your budget probably didn't limit you at all, I've used the Hertel and Reuss as well. Equally more modern spotting scopes are either unsuitable for our purpose or not significantly better than what you've got, in normal use, so you are ahead. Also in many situations the Hertel and Reuss or Nickels are simply more practical than the 30X80, or even 30X75, Optolyth as they are lighter, smaller, easier to carry and also slightly longer when extended making it easier to get a good rest with them.
I got a cheap Hertel and Reuss for the cottage my girlfriend rents (didn't want to put big money into something that might walk or get damaged) and although the draw is a bit loose the performance at reasonable magnifications is good. It must be said that I think the 60X magnification is a bit optimistic
One thing that might be useful is that the Glasgow binocular repair people in Hope St. can do most work on these scopes and will do a service and clean for reasonable money, it doesn't sound like yours needs it but it is always an option if there is a bit of dust or fungus on the elements.