Sidewinder's are great regs. The Ion I used for most of the last year has one on it and is very very consistant.
But, one thing you should think of, why change?
I picked the sidewinder because I got a brand new one for cheap, as well as the 'sidewinder' capacity that the bottom swivels and keeps the hose out of the way.
You dont need to change, so depends on your vanity and your cash flow situation!