I have a Twin Spot in one tenor uke and a Aloha Spot in another tenor uke.....As mentioned in previous posts they both sound the same to me, however the Twin Spot has longer lead wires that had to be zip tied together inside the body so they did not bounce around.
I also purchase a K & K belt mounted Pre Amp which really helped with tone and volume.....Both pick ups have two transducers that stick to the inside of the sound board underneath the bridge that are supposed to placed between the G and C strings and between the E and A strings.
I have had a Misi under the saddle pick up, but my personal opinion is that it mutes the volume of the ukulele between the saddle and bridge when not amplified.