No direct experience with the Arken. Have a good friend who's been running one for about a year. He's happy with it.
I have an Optika 6 that I've been happy with. So far so good on tracking and RTZ, but haven't had enough rounds through it to really draw any conclusions other than at this stage if the game I'd but another. Glass, ER, EB are all great. Hoping to get more shooting volume and knocking around use on it over the winter.
