I have been using the Fenris Carbon Quads for a while now. I had tried a few in the past including Viperflex but never quite felt at home and despite knowing they gave more support and extended range than my twin sticks, I just preferred mine for ease of use, especially at night when foxing when you often need to pan a long way when a fox moves. On ground with anything longer than prepped grass, this can be a pain.
What changed my mind was shooting more small targets like rabbits on the golf course at 100yds or so with the HMR and basically not being able to headshoot bunnies from twinsticks with the reliability that I needed. Undulations mean a bipod is not always possible with the height of sticks being a massive advantage.
I did a ton of research and looked at the usual pretenders before settling on the Fenris, mostly because they seemed to be the lightest and I liked that you opened them different amounts to allow for height differences rather than my mates Viperflex which are set at a certain height and then only open to that height. I found that prohibitive in terms of getting one of the sticks in to my side/chest which really aids very very accurate shooting. The other bit that sold it to me was being able to fix your rifle in situ allowing a hands free situation. Something that has been brilliant to use.
They are versatile, they are very very light, I like the front and rear mount parts where the rifle sits and I find them very intuitive and quick to use with micro adjustments resulting in great comfort and therefore hugely accurate results. I would genuinely use them to work up a load or zero a rifle. The little click lock bits that fix the sections together are not loose and there is not play in them at all. They are easy to carry with little neoprene type grips half way down and they are quiet to use. Being carbon, they are also not cold on the hands like metal is.
The foot strap thingy that allows for you to let the sticks fall away from you with the rifle in place is a good concept in theory but in practice it is crap. Nobody wants 6 foot of paracord flapping around while carrying them. I have modified mine with my own tiny bit of paracord (about 4 inches) knotted in the originals place with a loop on one end. I then have a separate bit of paracord tied to a small karabiner type clip which I wear round my neck like a fox call. If I want to be hands free, I just clip it on to the sticks and they then cannot fall away from my body. I don't have to worry about keeping my foot in place etc. Much more versatile, more safe and no pieces of flapping cord.
Cons - Hard to find fault with the design but I have not used them for long enough to reliably say the build quality will stand up. The carbon legs are certainly fine, but as with most sticks, the little fold out bits and leg stops are plastic and part of me doesn't like plastic. Time will tell if they last the distance.
The silicone fastenings to lock the rifle in place - Same thing really. They work brilliantly (I only use the rear one) but again time will tell if they last the distance. Would be easy DIY fix if the worst happened though and I can see in time this being a point of failure. I don't have enough experience with silicon rubber to know for sure.
Overall, I am very impressed. Best bit of shooting kit I have bought in a while. In the last week I have used them to headshoot a squirrel with the HMR at 100yds, taken few rabbits from 20-130yds, shot a Munty buck at 140yds and also 3 foxes with one of them being at night at 200yds.
I hate to admit it but my twin sticks have not been used since I have had them.
If you want any close up pics of parts that are not shown well online or an example of my paracord hack, just shout.