I've had SW RPG for ages, and not even bothered to get excited... I have had T20 for a week and already gotten more enjoyment from it. Then again, I am a classic traveller fan... although SW is a huge part of my influences, as far as RPGs go.... nah.
T20 is still my first choice in playing in the sci fi genre, but M&M is a great game as well. I just got it last week and can't seem to put it down for very long