has anyone ever played Vivaldi's concerto for 3 violins and piano?? What do you think of it??

No, no-one ever has. What they may have played is an arrangement by someone else of what Vivaldi wrote, probably for three violins and a string orchestra that might well have had a bassoon added to its bass section and a harpsichord or an organ playing from a figured bass.

yeah well obviously it was originaly written for continuo but I was wondered what people thought of the picee itself. Easy? Hard? Fun? (The F major one I mean!)

Moderate. I could play it but not very well. Because I'm just starting to learn Grade 5 stuff.