I shaved with a DE for about 20 years before finding straights.
The DE does a pretty decent job, but it still uses disposable blades. The disposable blades while sharp, just don't have the feel of the well cared for straight razor. The feel is not as smooth. It's hard really to describe. I think the stropping is what makes the difference. Get good at stropping your straight razor and you'll not wish to shave with the DE.
I went back to the DE a few weeks ago, was in a rush or something and thought I'd save some time. OMG. lots of blood, did not feel that same smooth shave... It will be a while before I go back again... I love my straights!!!