I have a EAA Witness Match in 10mm. I haven't had it long, but so far I really like it. That said, if the G17 is your self defense weapon, I wouldn't trade it. I don't trust the EAA enough to put my life on the line.
the witness is a great pistol, but I am a pretty practical person, I probably would not get rid of the glock, as they are just too darn reliable. Save for the EEA. I traded my tz75 pre-witness, for a glock 17. Would do it again, but those steel pistols are aweful nice too.