I have been happy with my DLE engines, something is just not right with my 30. There seems to be this montra to chase light weight all of the time. This is fine but it depends on the type of plane. Warbirds need nose weight. Also, I bet there is little difference in weight between a mag engine and an EI engine. All of the mag weight is concentrated up front where you need it. With an EI engine it is in the ignition and battery. These can be placed anywhere I suppose.
With an EI engine there is another battery to deal with, a variable for failure really. In all of my years of flying, the batteries were the weak link. If I can avoid them I do. For sport flying fine. It is too bad the EI will not take a good cell technology without a regulator. I am using Eneloop cells with mine that seem to be the best, but I would like to use a lipo or something else.