I'm happy to offer it, I already own two! (and an Optika6)
Simply, it's the best scope I've used at any price. The biggest difference is the optics. Crystal clear at all zoom settings, center to edge. I'm now literally spoiled (as noted in this thread) The Optika5 4-20x50mm is the only zoom scope I've ever used that is as clear @ it's max of 20x as it is at 10X. I own scopes that go to 25, 27, 30 and 35x. None of those set to 20 (or higher) are as clear as the Optika 5, and that includes a significantly more costly Meopta Optika6 4.5-27x (the 6's other downside is it's 25 yard minimum side focus)
The Optika5 does not have open tactical turrets, but they are crisp, confident and accurate. (The Optika6 series offers larger open turrets if that's important.)
One complaint I've read is the lack of tailored air rifle reticles. The two I have use the relatively simple BDC semi duplex. No idea how useful that would be for some serious competition target work, but it works well for me. It's far easier to use and see when pesting than my Crimson Trace, MTC, Sightron,. Hawke etc.