Technical note first; Surprisingly high output, almost into the range of an active pickup, so just plug straight into your amp.
I come from electric bass and EUB playing to finally getting the real deal - a double bass. So having gotten a double bass I needed to get a pickup because double bass makers live in the 19th century and haven't yet realised they should have a built in pickup like every acoustic guitar that costs more than 50 pence.
I went for this pickup because it was moderately priced and looked easy to fit, as well as getting good reviews. I needed to do a tiny amount of sanding to open up the bridge but it only took a few minutes and then it fitted in just fine. The sound seems very authentic to my my ears, it picks up each string evenly and pretty much reflects the bass itself.
For live music, I'm willing to accept that a pickup costing twice as much might sound better in a side by side comparison but a) that never happens at a gig, and b) when the rest of the band is playing, any difference in tone will be swamped by the other instruments, and c) no one wants to hear your bass solo, so give it a rest.
IMHO you need to pay a certain amount for a pickup or it just fails to perform the basic functions. If you pay more then you get into a region where stuff works ok, and after that it becomes diminishing returns where nobody but you in your front room can hear what you paid for (I'm talking about for basses, it's different for guitars, fiddles etc). I reckon this pickup is at the point where you get a pretty good deal and spending a lot more won't make it that much better.
