I do not have experience owning one, but I am aware that they are very dependable. I really contemplating getting an Impreza before we bought our Jeep, but it was just too small. However, if I could afford an STI now, I might buy one. I also like the new Legacy. The water leak issue is non-existent in the newer models and was only on sunroof equipped Pats(I believe) so don't get a sunroof.
But for $15k, I am guessing you are looking at FWD only or used? This would be a disadvantage compared to the Subie, which is AWD. If you are looking at used, you can get a Patriot for cheaper, but try for a lower mileage 2009, 2010 so you can get the full advantage of the remaining warranty.
As for warranties, Subaru only offers 3/36k with the vehicle. Extended warranties are available, but Im sure they are $$$ like all extended warranties.
"Lucy"-All-Terrain, all-weather, AWD, 18" of clearance, can jump for more clearance up to 3.5', amphibious, runs on dog food, protects family. More capable than my Patriot?
The new budget-"It's a good deal, but some poor people remain oddly unf*cked"-Jon Stewart