I just ordered a cz 21 and having used the 1280 x for several years, I always disliked the no pinpoint option. I have 2 questions. Should I keep the lifetime guarinteed 1280x as a back up? does it work better the the new cz21 in certain conditions? and does anyone have any words of wisdom for the use of my newest arrival? I will be learning this machine on the surface but scuba hunting is my thing. Thanks in advance for your time