I've had a set fitted for about 2 months now and love em.
On the black top they handle just as well as the standard tyres.
I've done a couple of trips so far in rocky loose terrain with some nice hill climbs and they performed very well.
I don't normally play in mud but last Thursday I was out at Glasshouse and was very surprised how well they self cleaned and how well they performed in the mud I did go through.
I haven't had them on the beach yet but I can't see there being any problems.