I’ve had the V2 dual extruder on my Taz5 for quote a while and I print mostly successfully with it. My only drawback with it is when I use the second extruder on a flat top surface, I get vibrations that carry over from the first extruder that give ghost ripples in the print. I want to get away from that, because the vast majority of what I do has flat top surfaces. I’ve spent considerable time tweaking and calibrating and adjusting and can’t get away from it, it truly is part of the design of the printhead. But I ain’t mad. 
I’m looking at the V3 extruder pretty seriously. I understand there are some bugs with it and I just want to make sure I have a firm understanding of the bugs before I commit $500 to it.
There are three mechanical things that I have read about.
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The top screw mount is off so that the extruder does not sit down securely in the nest. To me, that’s not a big deal, take the die grinder out, elongate the hole, back in business. I’m sure Lulzbot will take care of it in the future, but to me, it is not a big deal. I void warrantees on a daily basis without a second thought.
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Filament is a little tough to load. I think I can deal with that, personally. I generally load a full roll of filament and print until it is gone. But if someone is changing colors frequently or changing colors on the fly, I can understand that being a problem. I’m sure there is a design fix out there somewhere and I’m sure Lulzbot will figure it out before too long.
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Filament cannot be removed if the hot end is cold. It’s just generally part of my work process to heat the hot end before removing filament. …unless I am oversimplifying things.
Those are the only 3 things mechanically that I’ve heard of.
Software wise, Cura 2.6.52 seems to be rather buggy. I’ve tried running it and ran into too many problems, not even related to dual extrusion. I’ve resigned myself to sticking with Cura 21.08. I print with my V2 dual extruder without problem as far as software goes. If I would get the V3, change the dual extruder offsets through calibration and maybe tweak the start2.gcode, I would think I could print without problem? I like to be an early adopter on technology, but I tried Cura 2.6.52 and just had to punt until the bugs got worked out. Am I oversimplifying that? Sometime, when I get time, I want to work on Cura 2.6.52 and try to hash some stuff out, but right now I just need to print some things.
If I get one of the V3 dual extruders, am I setting myself up for massive disappointment… or will I be able to deal with the quirks and make some awesome prints? Can I get around the problems or do the problems run deeper than I envision?
Does the printhead run more stable than the second extruder of the V2 printhead?