I'd bet you could also find folks that are perfectly happy with it.
I also have the Aqualung Mikron reg and the Airsource 3. As with the Zuma BC, I have 100 dives with this combination. Have been very happy.
I have found that breathing requires a lot more effort and can become uncomfortable when I get to about 90 feet or so, to the point that it discourages me from doing deeper dives. If possible, I would like to find a regulator that can mitigate that effect.
Bubble issue: I've never come up and said anything about bubbles being a nuisance, so it hasn't been a factor for me. I looked at pictures I have taken through the years of other divers and some have bubbles in front of their masks and some don't. I don't think that because the divers with Sherwood or ScubaPro regs had bubbles in front of their masks means that's always the case. I have selfies of me with and without bubbles. Body position has a lot to do with it.
Breathing: The Mikron has an adjustment knob which allows you to change your inhalation effort. This could be a plus for you. I have only ever played around with the knob once. Not that it is important to this discussion, but during my one experience of throwing up while below the surface, the Corn Pops were easily disbursed through the reg.
Service: Have had the 1st and 2nd stages rebuilt one time and the power inflator on the Airsource 3 replaced after my last trip. It was sticking on my next to last dive causing the BC to inflate. For my last dive I used the cut off valve (on the Airsource) to manually allow air to enter the BC. Was glad to have that feature.
Can't really speak to comparisons as I have only used rental (without problems) up until 2010 and the Aqualung was my first and only purchase of a bcd and reg with the purpose of traveling light/compact in mind.
I would imagine most everyone is happy with the regulator they settled on.
This is probably why you can't go wrong. Remember on SB, you will get recommendations/advice from people who do 100 dives a year as well as from those that do, like me, 30-35 a year (mostly Caribbean.) Sometimes all of the info you get can be overwhelming and you can start to overthink what you want. I'm not recommending anything but only giving you my experience with the equipment you are considering. Be happy with whatever you get. After spending a few weeks shopping between a SUV and a minivan, we made a decision and are now stuck..I mean excited about our purchase. We actually love it which is good because we'll have it for many years to come.