The only thing I'm just concerned with is volume issues with the Myers.. I'd like to get one but need to know about how much you can turn up ..
(For example using a 1x12 or 4x10 cab and a 250-500watt head)
Etc.. There are situations with the double bass that unfortunately we need to turn up..
I can show you how loud the schertler gets before feedback..if interested..
I've posted about these before but.......anyway - While I haven't played with the Myers, all of these tiny electret condenser setups use essentially the same mic element and circuit for phantom power. A friend and I were making our own a couple of years ago, experimenting with different components in the circuit, preamps, mic elements, etc.
They all sound great, much better than any piezo. They all work well though an amp....and they will all feedback when you push the volume or input gain. If you are running them on club stages with big PA support, then you'll likely have issues as well. We all have our own definition of what loud is though, so your situation could work better than others. Mine worked great when I was running amp only for support in smaller gigs. The Radio Shack mic did as well. Like I said, they are all the same type of animal.
I'm not trying to steer anyone away from the product. They make a neat little package, and it will work great for certain situations. However there isn't any magic to it, or any other small electret condenser. They reject feedback very well because they have almost no range to them, but if you push the volume they react like every other mic anyone has ever put on an upright bass. I've tried four different setups. Two that I designed, the Geoff mic, and the RS mic. All of them fed back at almost the same point on several different amps.
If you don't require a lot of volume, then give it a whirl. If you want to push a 4x10 with 500watts, then use a pickup.