I've tried mine with several grips, including the JMs, Hogue Monogrips, Pachmayrs, and a very nice set of coke reproductions. I've concluded after much experimentation that the JMs (which are, in fact, made by Hogue) actually work best for me and that's what the gun is wearing at this time.
I shoot my revolvers exclusively double action and I like to rest my trigger finger on the gun at or slightly beneath the crease that's formed by the first joint. I find that it gives me better leverage and more control and that I shoot most accurately with the finger in that position. I have very large hands but, even so, I've discovered that I get the best trigger finger placement with relatively small and thin grips. Thinner grips enable me to put my finger more deeply on the trigger.
When I first began shooting with the JM grips I found that I wasn't always putting my hand consistently on the grip frame. Sometimes would be just right but other times I'd be too low. I also had the sense that the gun was squirming around in my hand as I shot it.
However, practice makes perfect. The more I used the JMs the more I liked them. Now, they feel perfect for my hand. They're relatively thin, enabling a deep finger placement on the trigger. And, with frequent use, my hand "remembers" where it should grip the gun. Gripping the gun with these grips has now become second nature to me.
As for front sights, I'm a fiber optic guy. I love the way one can acquire a target -- in daylight -- very quickly with these sights. No, I wouldn't recommend them for bullseye shooting. But for rapid shooting I find them to be unparalleled.