FYI: I have, use, and prefer Trijicon RMR optics on my larger pistols. Like you, I do my research. I don't buy simply based on cost but rather on cost and quality. I have experience with Trijicon, EOTech, Vortex, and other optics as well. Other than the windage and elevation "clicking" as it's adjusted, I'd say the quality of the Rad Micro Pro is on par or above other micro dots on the market. I also don't personally believe "clicking" is necessity or in all be all feature to worry about on a self-defense handgun that you’ll shoot at close distances and aren't going to be making adjustments on the fly like you would shooting longer ranges with a rifle. On a rifle, I'd require that feature. On a pistol, not so much. I use a laser site bore to zero at home or the range at 25 yards OR I co-witness the red dot with my irons. I can visually see the dot moving to where I need it to be as I turn the allen key, so no click needed. Then make simple, quick, and easy very minor adjustment at the range if need be at 25 yards. Clicking is not at all necessary or really needed IMHO. If I was shooting 100 yards or more with my micro carry pistol, then I might want the MOA clicking feature to help get on target. I reckon that's why fighting rifles like the M1 Garand, AR15, Fal, G3, Mosin Nagant, SKS, AK47, etc all have on the fly adjustable sights, and most handgun have fixed sights.
IMHO, you've become biased based on your experience with the CT low budget, cheap, no frills offering. That's okay. It's your money, and you need to be happy and content with what you spend it on. If the budget priced polymer red dot offering has forever turned you off from everything Crimson Trace makes now or in the future, so be it. I suggest you go with a Holosun optic on your Shield Plus. Just be aware and do your research as others on the forum and elsewhere have reported that they've had problems zeroing their Holosun optics on the Shield Plus because of how S&W milled out the optic cut. Some people don't have any issues while others say they have. You'll also will need an optic plate. I am not sure if the Trijicon RMRcc has this same issue. I actually have never seen anyone who uses a RMRcc on their Shield or micro 9mm's. That's something you might want to look into if you go the Trijicon route. There are also a couple of companies who will remill the Shield Plus slide to IF you actually experience any issues. (Maybe you will, maybe you won't.) There's a guy on Thehighroad.org who has Holosun 507k's on his Shield Plus and Shield 45, and I've never seen him complain, but in the same token, I've seen others members complaining about it on this forum and other forums.
Holosun 407k on a Shield Plus (w/ Optic Cut ) runs out of elevation adjustment. Anyone else?
M&P Shield Plus Optic choice
M&P Shield / Shield Plus Optic Ready Re-Machine for Holosun 507K/407K & EPS