My 2012 400 Sportsman and 2014 570 Sportsman look and ride similar. However, the 570 power difference is noticeable unlike the difference between riding the 400 & 500 Sportsman from the previous design. I have always been a Yamaha dirt bike guy, never anything else. But, now that I'm a 44 year old quad guy, I'll probably never buy anything other than a brand new Polaris again. Mine have been extremely reliable and bulletproof, granted, they have not been overly abused on a regular basis.
They fit and feel superior to others that I have ridden while swapping for a while with buddies on the trail. Each brand has something the others don't, pick the one that best suits your situation. I personally enjoy the enormous amount of dry storage front of rear. The racks are well built and well sealed against the storage areas. The riding position is rather neutral and comfortable. Last, but, certainly not least is the original price. I cannot consider buying a 5-6 year old other branded machine when I can pick up a brand new under warranty and well built Polaris. Price aside, I simply like it better than the competition in numerous aspects.
That battery placement though... Looks stupid and rather Chinese knockoff in terms of overall engineering. Mine has been submerged on more than a few occasions, covered and caked in mud and ice, never an issue. I have left the key on and killed my battery. It is certainly easier to access on my 2014 570 than on my 2012 400 under the rear fender. It's not like the rear mounted battery has ever seen less abuse inside of the fender well.