It's been a long time since there was a review on this item, so I thought I would add mine. I ordered and received my 16" version just over a year ago. I use it with 6.5 gal big mouth fermenters.
Beautiful construction vs. pinched end thermowells. I've brewed a dozen or so batches with it and believe it's a worthwhile upgrade to a "taped on the side" thermocouple. Fermentation is an exothermic process and this helps me get ahead of temperature spikes that might have otherwise caused off-flavors. After ~30 years of homebrewing, cold-side control has totally stepped up my game! Ordering another thermowell today (thus the review) so I can ferment 2+ batches at a time.

WOW! Perfectly packaged, and man I said “WOW” out loud about 3 times before my wife asked what the hell I was wowing. It makes the ones available for a few dollars cheaper seem like a rusty needle.I couldn’t be happier with this purchase.

Very nice, professional quality and great price!

VERY well made thermowell. i cant wait to try it out on my next brew this weekend! and best of all it was only $12.

I picked up my thermowell due to a very competitive price but after seeing/using mine, I would gladly pay much more. The quality and finish is very impressive! ...you won't go wrong buying your 'well here! Prost!