I've had my Howling Stones key for a while (easily soloed at 52), but the last time I went into the zone I died at the entrance. Now at 58 I went back and was able to solo quite safely in the north wing. Kills are the fastest I've seen anywhere since DSP rockhoppers and the experience is pretty fantastic too (comparable to Velks as a hot one). You do tend to take quite a bit of damage on some pulls though because there are times you just can't get singles. Also, you should bring gate potions unless you've got the time/ability to crawl to the exit, and have a detailed map available so you don't fall down the hole with the iksar monk (is that the same PITA from Plane of Justice?) who hits like a truck and has a TON!!! of hitpoints. Otherwise though, cool zone and the high DPS / low hp mobs are a good change of pace because it's just so much fun to tear through a light blue con before venom of snake wears off.