hi alex, from my experience you can use any SEO with this themes.
but if you enable curtain effect, im afraid it won’t be work as you expected.
the best way to get power of SEO plugin is by using normal load or disabling curtain effect.
as you may sometime hear, ajax website may not too friendly with crawler, but crawler like google right now is already very smart, it may not having any problem with ajax content. but another crawler like bing or yahoo may not as smart as google.