It was delivered just as expected.  There were no problems with the vendor.  The problem I ran into was that the jack was too large to fit through the f-hole on my mandolin.  My f-hole is 3/4" and the jack needs about 7/8".  I wish I had known.  If I valued my mando a little more, I would have just returned the pickup for an external model.  Instead, I drilled the f-hole slightly larger.  The rest of the installation went off without any problems.  I drilled a hole for the jack and fished it through with little difficulty.  We'll see how long the adhesive holds the transducer in place.  I'm thinking a few bumps might knock it loose.  I plugged it in and it worked.  The sound was about what I had expected and about what I had paid for.  A lot of the depth of the tone is lost and come's through in the high-mid range.  It isn't terrible, though.  I think with a little EQ I might improve on the sound a little bit.  I might work on placement of the transducer as well.  There is a little body noise that gets picked up if you bump the instrument as well, but it isn't too bad.

The bottom line is that this pickup does what you expect.  If you want spectacular sound, or have a spectacular instrument, don't be so cheap on the pickup.  If you have a $200 mando like mine, this pickup will probably suit your needs.
It was delivered just as expected. There were no problems with the vendor. The problem I ran into was that the jack was too large to fit through the f-hole on my mandolin. My f-hole is 3/4" and the jack needs about 7/8". I wish I had known. If I valued my mando a little more, I would have just returned the pickup for an external model. Instead, I drilled the f-hole slightly larger. The rest of the installation went off without any problems. I drilled a hole for the jack and fished it through with little difficulty. We'll see how long the adhesive holds the transducer in place. I'm thinking a few bumps might knock it loose. I plugged it in and it worked. The sound was about what I had expected and about what I had paid for. A lot of the depth of the tone is lost and come's through in the high-mid range. It isn't terrible, though. I think with a little EQ I might improve on the sound a little bit. I might work on placement of the transducer as well. There is a little body noise that gets picked up if you bump the instrument as well, but it isn't too bad. The bottom line is that this pickup does what you expect. If you want spectacular sound, or have a spectacular instrument, don't be so cheap on the pickup. If you have a $200 mando like mine, this pickup will probably suit your needs.