Got on really really well with it, however he is not looking to sell it!

Been hunting high & low for a fish in my budget & a 6.2" quad fin has popped up ...
Will i notice a huge difference in switching to a quad?
I should state i'm still a beginner & in the transition of switching from my 7.2'' mal, so 'critical turns in the pocket' aren't things i'm looking to attempt (just yet). Just general good rides with some nice turns thrown in on my good days

Any advice is most welcome as i'm pretty naive on this subject!