I bought this Vertigo case for my beloved Lowden acoustic guitar in conjunction with the original M80. I wanted to see which was the better option. Very quickly it was obvious that the vertical loading system is far, far superior. There were one or two things that I preferred about the original - the shoulder straps allow the guitar to sit a little lower on my back, it has a plectrum pocket on the neck brace in side the case, I like the white detail on the front pocket - but these little details pale quickly into insignificance when comparing loading systems. Putting the case on the floor and laying the guitar in it, or pulling it out is far more difficult and time-consuming than simply unzipping and pulling out, or pushing. I was a little concerned that the zippers on the Vertigo would scratch the body of my guitar. I have tested this and, though it could happen, it isn't an immediate problem.
In short, though I would like to port one or two tiny features from the original, I love this case!