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Bavsound and Bimmertech are kind of meh. The Bavsound subs etc. are rebadged Chinese drivers and it is not even clear that they are better than the OEM units in all ways based on measurements I have seen and made from the F8x platforms. The Bimmertech amp used to just be a rebadged Audiotec Fischer DSP/amp, which is very good, but you can just go to the source and get one you can actually fully tune.
It is a lot of work do it correctly and may not be for everyone, so perhaps they are worth buying if you don't want to go down the rabbit hole, but without proper frequency response measurements you are shooting in the dark and may improve one area at the cost of others.
People using the B&W coding without measurements are also most likely doing more harm than good. If you like it, great, but the filters are tailored for the response of the driver and if you don't update to the B&W drivers, you are getting some unknown result.
I do not know anything about Orella but I can tell from pictures their amp+DSP is also a rebadged Audiotec Fischer. Their sub looks like it is from the same OEM that makes Eton and Rockford Fosgate BMW subs and probably one of those rebadged. Not sure about their other drivers. Those are reasonable choices to start from so I am not surprised the end product sounds good.
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