I have two revolvers, different enough that I like the both without detracting from one another.
When I read the OP I was about to respond when I realised that I'd struggle to answer!
I slept on it (the idea, not the revolver) and have managed to squeeze out the following, but not without a degree of barrel scraping:
My Redhawk in .44 Mag:
I didn't like the grips so changed them, now they are fine. I didn't like the front sight as in some light it just disappeared! A FO front blade sorted that out. So the bits I didn't like are now sorted!
My Astra 680 snub:
I suppose the only thing that I'd try and change is that speedloaders don't work with this revolver: the grips get in the way. I even made my own low-profile grips with a speedloader/thumb groove in it and it still isn't easy to use, but it's doable. Aside from that, the option of +P would be nice, but given that 158gn Spl are not overly comfortable, I don't mourn it too much.
Other than that, I like them both a great deal!