hydraulic buffer tubes for pump shotguns

Anyone have any experience with hydraulic buffer tubes on pump shotguns? Are they worth it?

Are you talking about tactical kits such as these: https://www.mesatactical.com/product...and-20-ga.html

If so, the one that I have experience with is the Blackhawk Knoxx Stock: https://www.budsgunshop.com/product_...s_id/712012865

We had a couple on range training shotguns. I didn't like them because the shotgun felt 'different' plus, we taught push-pull and that tends to tame recoil quite a bit if you actually do it. Student officers didn't much like them either. After the first shotgun session during which they were more likely to pick a 'tacticool' shotgun out of the rack, the shotguns with these stocks pretty much remained in the rack during subsequent sessions.

I had one and found that it pinched my face and knocked on my hand. It didn't really have many advantages. I guess if you extend your stock all the way out, then it would be useful, but I run mine collapsed so it was a no-go.

https://i.ibb.co/Xjp8ZNr/20200523-015422.jpg

I bought one of the original style Knoxx stocks when they first came out---not the AR-15 style plunger-tube design---it took a little getting used to because the stock actually recoils into itself, but I found quite a bit of recoil reduction with this stock on my 18 1/2" bead sight 870---especially with the stiffer full-shout ammo---I left it on this 40 year old, polished blue 870... My other 870 is a "Police Magnum" (about 20 years old)---polished blue, 20" IC, bead sight with its factory wood stock---I put into the stock a "Mercury recoil reducer" I had lying around and installed one of the newer limb-saver recoil pads---that, plus shooting the reduced recoil ammo, tamed the kick quite nicely, but for "serious" work, both shotguns are loaded with full-power ammo! Both guns are totally reliable even through the older gun is pre Flex-Tab 2 3/4" only gun---in fact, ALL my 12 gauge ammo is 2 3/4" to avoid confusion... These 870s are my go-to shotguns when the "Peaceful Protests" turn out to be not so peaceful... My wife prefers a Mini 14 223 for these times...