Differences between the G4 and G3 Finesse Diabolo

I was looking to get a Finesse because i was looking to get back into Diaboloing. I had a Spinablo when i wanted to try Diabolos but it broke 2 days after i got it so i have some knowledge of Diaboloing. I have found that i can get a G3 for $38 while a G4 would cost me $50, what are the improvements or differences between the G4 and G3 and do you think its enough to be worth more money?