definitly ask for it but compare all the things they have in common and say you are used to these fetures for example the windows mobile the slide out quartey keybord micro sd memory card if you don't have a micro sd card on yours tell him you have a mac pc and can't sync so you have a card reader so you can transfer files only to a micro sd card etc.... don't worry it works I've done it ,worst that can happen they give you a diamond wich still is better than what you have now considering you phone is starting to die .... let me know how it works out I'd wish you luck but with a coach like me you won't be needing it lol!!!
if all else fails call retentions at sprint and say your gonna cancel your service then they will call asurion and tell them to help you but I don't think you'll need too remember don't threaten to leave unless your left with no choice this is your ace in the hole