Any MES owners please help. I am looking at buying a new MES and I found 2 that I have a question about. The model nos are: 20077915 and 20070312. They look the same but the first one is twice the price of the second one. There is a slight difference in size, but for alf the price not significant. Both have a better than 4 star reviews. Any help from seasoned MES owners would be much appreciated. Thanks, Steve