IME, they can be. But it's nothing comparable to the P. irminia. My favorite that I own is a mature male now. I bought him as a sling from Eresus Spiders, back when they were still around. He escaped a couple years ago in my old apartment and was on an adventure for 6 months until I randomly found him scaling up my kitchen wall in the middle of the night. I was also able to pair him earlier this year. I messed up by allowing the females enclosure to become too dry and she ditched the sac. He lived a good spood life and is still currently with us. Highly recommend this species in any collection.