The AS50R is the older model, the AS50D is the current one. I suspect the D has digital reverb rather than the analogue in the R. The main functional difference is that the D supplies phantom power on the microphone input, while the R doesn't.
I've had one for a few years now, and though I haven't actually used it that often it has done a fine job when required. I got it originally to use in a small concert (about 40 people) and it did all that I needed.
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