Besides his activity, his account also holds huge historical value in older posts, which will give an immediate boost in visibility to anyone featured in his sig. With that said, he's definitely worth the money, and if you're looking for a top performer, definitely go with his sig.
Thank you for your kind words SirJohnVonSlotty.
It was a real pleasure working with you in last few months, and I hope to see you back with some new interesting project soon.