I'd like to ask if anyone here has used the slip on rubber grips that slide over the existing grips and do you like them? I have an S&W Shield and really like the existing grips. But I'm curious if I would like the rubber slip on grips over the existing grips even better. There are a few makers, such as Lyman and Pachmayr. Do they actually, improve the grip, reduce recoil, improve accuracy as they advertise them to do? Do they grip the gun well or do they have some slip to them when shooting? Would you recommend them? I can not find any in the stores for the Shield to try on first before buying them, so I will probably have to order them. Are they a good investment or should I save my money?