Thank you very much.
Quite simply, for me it is outstanding. The support has been second to none, my stupid questions are always answered, and the updates are excellent. The implementation and integration into Rhino is very nice and easy enough to use.
While it may be argued that the integration isn’t quite as extensive(?) as Vray, for a new generation renderer, I can’t fault it. I don’t have to subscribe my life away to use it, which as a hobbyist, is a massive advantage of Bella.
The support for Rhino WIP has also been added with the most recent update. I don’t think as far as I can see that anyone else has bothered with WIP as extensively, or even at all(?). Even the Rhino Cycles 3.5 engine hasn’t got into WIP before Bella did. I think that is really nice to see.
Entirely personal to me:
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I am quite Scifi based really, so sometimes, resources like Chaos Cosmos being not in there can make it a little more difficult, if I want to place furniture or a person, just because you have to go off and find an open-source resource, which is fine generally; but then sometimes you fight with whatever materials come with it.
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Sometimes I am eager to see what my Intel Arc can do as a ‘fun new/experimental toy’, so sometimes it is sad to see my GPU sat doing nothing.*
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For those used to the (many rubbish) pre-loaded materials that come with many renderers; they are not there in Bella. However, the Bella Quick material has largely resolved speed of material creation.
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The few parameters that are scale invariant (noise-like procedurals) can sometimes need a bit of thought to get working how I like, compared to say something easy like GIMP.
*I waffle on about this GPU, but this point is an irrelvance for the very few people on Earth with one. But they are working on GPU support as we speak. Perhaps we will see some CUDA implementation 
Overall, I would immediately recommend Bella all day long for anyone asking, especially if you do not want to be enslaved to subscribe.