I have to disagree a bit with 86golf. I'm new to tennis but I've played table tennis for years so I know how to look for differences in equipment.
I'd say the LM Radical is more than just a "touch" stiffer, it's noticeably stiffer. That's not to say that it isn't comfortable to hit with, but compared to the MG version, the MG is just a better and more solid racquet all around. It's well worth the extra money you pay for it, which isn't much.
I demo'd the LM Radical and was pretty much set on buying it. I was lucky enough to find the MG Radical on an auction site for cheap (the seller didn't mark it as an MG so it didn't get much attention but the picture clearly showed it was an MG). People on these boards had talked about how soft and plush the feel was, and I was a bit skeptical because I demo'd a Dunlop Aerogel 800 which is supposed to have a soft feel as well and I hated it. When I took the MG out onto the court and hit with it for the first time, I couldn't have been happier. Same great control as the LM Rad, but more solid/soft/plush/comfortable feel overall.
It's also more solid with off-center shots. When I hit off center with the LM Rad, you knew because the ball would go into some crazy direction and there was a lot of feedback from the racquet. This was a bit off putting to me at first because it showed my true noob-ness, but I had decided to stick with it because I figured it would force me to hit the sweet spot every time. With the MG, off center shots are more solid and stay in the general direction that you're hitting towards, and you don't get as much of that warping feedback that you would with the LM.
Overall, if you have $20 extra, put it towards getting the MG. The ONLY thing I despise about the MG is the horrid paint job LOL. Hope that helps.
I personally don't post to agree/disagree but to answer OPs question and/or share my view.
