About ten years ago, give or take, I experimented with a few chassis-type firearms simply because they looked interesting and were a new-to-me idea. I had a couple of Rem700's outfitted with an MDT LSS and an Oryx. In fact, I made a point of using the LSS one as my primary coyote rifle for one entire winter.
In terms of accuracy improvements, I can't say for sure that there were any, but those guns were already nicely set up and bedded in HS stocks so they were pretty accurate to begin with. Certainly, the chassis guns were IMHO very comfortable for bench shooting at the range, and I especially enjoy the ability to easily change out the pistol grip for larger aftermarket ones.
I found that I didn't really care for a chassis for hunting. For me a traditional rifle carries much more comfortably in the field, but that's likely just a case of being accustomed to the one configuration over the other. I've never had a truly lightweight chassis but that would have gone a long way towards improving my enjoyment of them.
For extreme cold weather use I found the metal stocks very uncomfortable. I don't like shooting with gloves on; I can tolerate very light liner gloves but that's about it. Anybody suggesting that a cold metal stock isn't a negative should leave a couple rifles outside on a -30C day...one wood/synthetic and the other metal-stocked...and then pick one up in each hand and compare for themselves.
An issue for me was accessing the safety. A side safety like those on the Rem700, or worse still a tang safety, is a very awkward reach-around when shooting a true full pistol grip like on those two chassis I had. Silly me, I still shoot like a caveman, i.e. I wrap my hand around the pistol grip completely including that wonderful opposeable thumb we're so proud of. If you lay the thumb along the right side of the pistol (for a right handed shooter) like the cool kids do the safety will be easier to reach but still not as comfy as a traditional rifle stock.
An exception to this is the Sig Cross, on which the safety is easily accessible on the left side of the gun without breaking your grip and waving your thumb around to reach it. IMHO, an ambidextrous safety like the one on the Cross makes a huge difference in ergonomics; I bought that gun mainly to try out the integral-chassis design and didn't realize until I had it how much I liked the safety on it. I still don't care for the Cross much as a carrying rifle, but for hunting from a fixed position like a deer stand it's a sweetheart. I've got the coldest parts of the thing covered with tape or otherwise insulated from my hand, and the vertical grip combined with the safety make for a great shooting package.
I don't think they're considered a chassis, but the hybrid designs like the MDT XRS, the KRG Bravo and the MDT Field are, IMHO, much nicer for hunting purposes. They carry much like a traditional stock, they have the advantage of that vertical pistol grip but they are still open in the tang area for easy reach and manipulation of the safety. I especially like the Field stock; it's not as easily adjusted but once you have the comb height and LOP set up for you, there are fewer knobs and protrusions to get snaggy in the brush.
Any of these stocks become way nicer to hunt with when used with the nice short 3-round MDT mags, which allow a nice mid-gun carry grip without any downward-projecting obstruction at exactly the wrong place.
I no longer have any of the full-chassis true-pistol-grip stocks aside from the Sig (which isn't going anywhere). I still use an XRS and a Field stock and quite like them both. I think my ultimate "precision hunting" stock would be an MDT Carbon stock...perfect shape, warm to the touch, lightweight...but I don't want to blow that kind of cash on one now that I am becoming a more and more sedentary hunter as I get older.
Really, you aren't going to know if you like them or not until you try one or two. Just don't fall into the trap of rationalizing that you love it just because you bought it. If you do enjoy it, great; if not, you're not making a lifelong commitment, you're just buying and trying a rifle stock that you can easily sell later.
