Anyone have any experience with this stuff, I built a feeder and wanting to put some out to help my herd out.

My unqualified opinion, the stuff works. That being said, you will have to put it out in multiple sites, allow deer to reach 4.5-5.5yo, and
feed them it in great quantities for a few years. Doing it the right way cost a PILE of money. If you have the money, not my business, and
are willing to put the time in, you will see improvements.

Me and four other guys have some land leased and buying it wont be a problem, just dont want to buy it then them not eat it, or it be like every other so called miracle feed and it not do a thing for the deer.

It will be money well spent. A very high percentage of DIGESTABLE protein in it. Most advertisements of 30-40% protein is garbage. That stuff you are talking about shows 20% and the majority is digestable. The protein will also help the does immediately in their lactation, and in turn help give the fawns a boost. Quality protein pellets are no joke. They will work, but you cannot shoot them too young and you must give it time to work. I would not expect any noticeable changes in 2 years. Within the 3rd year, there will be noticeable changes. That is, if you feed it to them during the key months, and pour it to em. If you can do it and have quality neighbors, I would suggest it.

We have been feeding it for years, and are feeding it now. They make different protein levels. The deer love it all. Never had any to spoil because the deer ear it up. Gibow put me on Land Of Lakes Dairy pellets, they love them too.

I trap for several landowners in Alabama that feed Record Rack and I have seen it fed side by side against Purina Deer Chow. The Record Rack is an excellent feed, just be prepared to do some coon and coyote trapping (even the coyotes will eat it from time to time (trail camera footage of this happening).
Deer readily take to Record Rack.

In my humble opinion it may be the best deer feed currently on the market.

EVERYTHING likes my record rack 20% pellets. Im thinking of switching to 18% pellets this weekend. I dont know who manufactures but I like the price. $7 for 50lb is way better than $11 to $14 of same weight and my neighbor already feeds with this stuff so I feel like the deer and all the varmints are BROKE IN.

Record rack is a good product, For example Purina is a good product also, but at twice the cost I don't think the extra price is worth it. The sportsmans product is good but contains corn/protein pellets and will attract more coons, etc. Record rack or maybe Im thinking someone else used to also add roasted soybeans to the corn/protein pellets, I fed it on the place I hunted in TX and the deer and turkeys liked it a lot. The professional label is only protein pellets. Some of the brands pellets with the water protection do seem to be more durable but the deer don't seem to like them as much to me, If I were feeding from a spin type feeder I would probably be more inclined to use them as they flow better and hold up better to ground moisture leaving less mess and waste.
The deer do like the Land of Lakes dairy pellets but the only ones I can find are 16% protein I've heard they make 20% but I haven't seen them, I am currently using Ware's 20% Dairy Pellets, they also make a 18% Buck Booster product, but the dairy pellet is cheaper with more protein. I would feed what ever you can afford to keep out as much of the year as possible, the critical times are Dec-Mar and Jun-Sep and you will see much more usage during these periods, when the deer have more available natural and food plot forages they will slack up on the pellets.
For starting pelletized feed, I would start by feeding corn and then gradually adding the pellets.
A year round feeding program will show results, really good with a food plot and enhancing natural vegetation. You will see some results in a years time, but especially after several years. If you have good neighbors and can let bucks get 4+ you will really see some gains, but even the younger bucks will be much better, you will see fewer spikes and 4 points and more six and 8's as one year olds, Ive seen several 9,10's and even an 11 point one year old. The does will be heavier and will have better reproduction rates and survivability of fawns so you should have more deer to see and shoot and your property will be able to hold more deer per acre. For areas with little or no Agriculture nearby (Pine plantations) you will see better gains and more year round usage.

Gonna have to learn how to do some serious trapping, that will help the turkey populations also.