The VLTORs are awesome, great upgrade to a standard stock. Please make sure you have a Colt buffer tube before you buy. If you dont, you will need one, or one of the brand new VLTOR buffer tubes. These stocks will only fit on Colt or VLTOR tubes.
The VLTOR will feel wonderful to your cheek. The battery storage tubes really round the stock off and provide a whole new feel to the gun. The fact that you have waterproof battery storage is a huge plus for those of us who run battery dependant accessories. The plugs at the ends of the stoarge compartments can be a little hard to manipulate at times, but I suppose their being tight is part of what makes the waterproof.
The included rear QD sling swivel is also an excellent option, it prevent us from having to go and buy one like so many of us have in the past. All the holes molded into the stock leave future options, upgrades and additions wide open.
VLTOR is also a tight fit. I think they will probably loosen up a bit as time goes on, all of my stocks that were once a snug, solid fit have eventually loosened somewhat. I havent had my VLTOR for long enough to say if or when it will, but I suspect over time and use it will.
The Magpul stock is another great stock and if you can justify spending $100 or more on any one stock, the Magpul is easily worth what they ask.