There is a lot of controversy surrounding this driver.
Some claim it to be a Fostex FE-103 just a different color,
while others scoff at this and say it is a cheap knockoff or imitation.
All that I can say is that it works well in enclosures designed for the FE-103
and it only costs about $5 or less on clearance and that is enough for me!
These little guys have been used in everything from TQWP's to sealed boxes
to wild PVC pipe setups...all with very well reported results.
Also, check them out in Godzilla's BK101 article!
I have 8 of these so far and have a line on about 6 more.