I do find myself using the MEU most of the time. The sight picture is better than the 1911A1 as you say, also the MEU has a wider grip and maybe a wider body. Not sure of the latter. The Detonics is a real peach of a pistol. It fits your hand nicely and for such a small barreled pistol it is surprisingly accurate. Of course now I've said that, the new Pocket Pistol comp will show me up.
As for the MP7 try this link to RedWolf Airsoft, there is a very comprehensive review along with an illustrated strip down guide.
http://www.redwolfairsoft.com/redwol...l?reviewID=234
ATB