It’s gotten pretty cheap! Although, IIRC it won’t correct astigmatism.
Can you use scopes? I’ve got a cheap little illuminated 4x on my RFB; the only reason I’d replace it with a red dot is for a better sight picture – mine has horrible eye relief – but I could also fix that by buying a better scope.
I want a red dot on the PPQ because, while the iron sights are actually pretty good, it does take time for me to acquire the target to achieve any decent accuracy, and I have this idea that a holo or red dot would make this easier/faster. I suppose even an expensive 1x illuminated wouldn’t be much of an improvement for you in that area, huh?