I've heard bad accuracy issues with the R10 Tris, Don't know how true they are but something to consider. I have a S400 and wouldn't dream of selling It! Pellet on pellet and It's not gone wrong since I bought It S/H a good few years ago. I've just got a MK2 rapid and that Is a lovely gun too. Very smooth to shoot and has a phenominal shot count over 400, More than enough for most hunting trips