I use nostromo before and my family last year bought me the G13 keypad and I use the g13 now for over a year and never had an issue.
Just a tip though if you are setting up a macro to do something other than normal keys like bring up talk or rcon or anything other than a simple one key then put a delay after the very first command. Like to talk type the T key then a delay then what you want to say
I use it to say things like "Nice shot" Thank You" Welcome to our server Please visit our forums etc.