Assuming you are talking about the Opticron ES 80 GA ED/45 deg fieldscope, then I can advise you of the following: I bought one a few weeks ago, having upgraded from a Nikon 80A spotting scope with a 20-60 zoom lens. I admit that I am not hugely experienced in birding, but maybe that is good because it means I may be devoid of some of the snobbery that seems to imply that to be good, a scope must be a Swarovski one that costs at least £900! Although I've only used my new Opticron scope a handful of times, I think it is EXCELLENT, & am completely happy with it. The image is (to my eyes at least) perfect, the scope weighs hardly anything, & the 20-60 zoom lens is amazing, even when you zoom right in. I also think the scope is really good value for money when you consider that it costs less than £500!!
A word of acution on the zoom lens though: I was going to buy the SDL 20-60 zoom lens, though I thought I should check between this and the HDF first. I phoned Opticron & they were really helpful - they basically said that unless I wore glasses (which I don't), I'd be better off getting the HDF 20-60 zoom; this shows that Opticron also provide good customer service, as they could have made another £50 or so out of me by advising me to buy the SDL (I bought the lens girect from them).
If I have any complaint about the scope it's that, when fitted with the stay on case, it can be a little awkward to access the focus wheel as its located under a velcro 'pouch'. This is however only a very very tiny gripe, & in no way detracts from what I think is a really good purchase.
Andy Fallan