I thought I'd do a Proper review for you guys, since there doesn't seem to be that many good reviews online.
A bit of background for you first:
I am a professional musician/singer, and do 15 to 20 gigs a week. I also am sound engineer, and therefore I've been using sm58's since I started my life in music.
In case you didn't know, every engineer has a few sm58 mics, partially because they are the mic of choice for many artists, partially because their EQ is very familiar for an engineer, partially because they are INDESTRUCTIBLE which helps with careless musicians and singers (Especially Singers :P ), but mainly because we were told to use them.
Now as for the superlux PRA D1. I had never heard of it. I only found a couple of reviews, and it was difficult to find it on their site (it's on the .com.tw site, its not on the U.S superlux site, which looks like it was made by a preschooler to be honest). But for this ridiculously low price I thought I'd give it a shot. And boy, I am pleased to say that this mic works wonderfully on stage.
Since I, as a singer, only use the sm58 on stage I will compare the PRA D1 to that.
Sound: The sound is very similar to the sm58 but not identical, it has a slight boost in the bottom end, but it doesn't sound muddy through my system, just different (as one mic model sounds different to another). For my voice I use the eq to slightly roll off the 150 - 200hz mark (as I also do a little with the sm58) and the mic is almost perfect. The top end is a lot like the sm58, so no real sparkle, just a natural sound that rolls off around the 5k mark. In the studio, going through expensive monitors, you can hear the difference between the two mics, but on stage, through an EQ, you can make these two mics sound identical with very little EQ changing. Also I have no problems with feedback from the speakers.
Quality: The sm58 is definitely built better, but the PRA D1 is not far off. It feels very sturdy, the grill looks very protective (although I would like to know where I can get spare grills or whatever fits, I'll edit this when I find out). When it is handheld the sounds made by holding it are about 5% louder than holding the sm58, but only if you grip it really hard as the paint rubs against your skin, whereas the paint of the sm58 seems to slide against your skin even if you grip hard. 5% louder means nothing on stage.
Feature: Same features as an sm58, sturdy body, and no offswitch. The only main difference is you get these same features at UNDER A FIFTH OF THE PRICE! You could buy 5 PRA D1's and still have change left for the price of an sm58! Buy a spare grill for the sm58 is almost as expensive as this whole mic!!!
Overall I can say that I am happy with this mic, VERY happy. Don't get me wrong though, the sm58 has nothing to worry about. It is a great mic and has been used since the beginning of time itself, and will carry on being used, but if someone was to give me a superlux PRA D1 on stage I wouldn't be disappointed at all. In fact I would be thrilled that someone else knows about this mic!
Just so you understand how I feel (in case you haven't figured it out yet), at every gig I do I always have an sm58 with me, and I planned on using the PRA D1 for backups, spares, and for backing singers, but I find myself reaching for the PRA D1 every time I set up and start my show. That's how much I enjoy using this mic.