I haven't seen a direct comparison but this post has some impressions relating a similar 50mm scope to scopes in the Nikon's class:
There's a generally positive review of the new Celestron Hummingbird x9-x27x56 "micro-scope" in the latest edition of 'Birdwatch'. It uses ED glass, is waterproof, the FoV is 74-32m at 1000M and only weighs 590g (inc. eyepiece). There's an even smaller x7-x22x50 scope which weight 540g (not sure...
www.birdforum.net
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I think that whether you would find it to be of value and enjoyable is pretty subjective. The cost ($165 on Amazon US) and size mean there are definite optical compromises and depending on your tolerance for these they may outweigh the benefits for you. Your mention of using it alongside top/alpha binoculars gives me pause as that will make the compromises more apparent. I use it alongside Kowa 6.5x32 BDIIs that, while generally well regarded, are certainly not in the alpha class.
Generally speaking, the most apparent compromises for me are the narrow FOV (4.5deg @ 9x) and high field curvature resulting in a smaller sweet spot. There's some false color on high contrast areas at higher powers (varies with eye placement). I've been pleased with brightness, color, and sharpness from the scope for what it is - a low power, compact spotter that fits between binoculars and a standard spotter.
The Celestron Hummingbird ED accepts standard 1.25" eyepieces (unlike the SV410, but at more than 2x the price), which might help with the compromises at the cost of going to a fixed focal length EP in return for a wider, better corrected view. I'd speculate that a Nikon ED50 would best both of these optically.
Personally I enjoy the scope and will use it more than a larger spotter just because it better suits the way I observe most often. To me the most impressive thing is that the 56mm Svbony gives better views than I would expect for something of this price and size.