To me it looks pretty smooth for PS2 on the go. Emulation had definitely come a long way in the past few years. The Aya-Neo certainly isn't cheap but good things rarely are. I may eventually get one or one of the future upgrades we know are probably coming but it's currently a bit out of my budget with my hands tied up in so many other things.
Hit the link below for more information on this very powerful handheld.