Thanks guys. I have 2 Gen II Viper PST 5-25x. I have been reading about how the image is "milky" and what do you know I took both rifles to the range and sure enough I noticed it. Both are barely used, each has less than 500 rounds on it. Never abused, torqued down to the proper specs etc. One is on a 223 and the other 22. What a disappointment! I'd like to replace these eventually, but not sure I want to do it right now. Will keep the Cronus in mind. Any particular generation to look for or avoid?
Back to my original question....the 3-15x or 3-18x would be for my AR to plink at distance. Anything with more magnification is going to be way more than I need and will weigh the rifle down more than I would want.