Trying to decide on an Instax mini to buy. After going through all the Fujifilm Instax mini series I got to a final face off: Mini 8 vs 50s, bu then I realised the 70 is an upgrade to the 50s for just the same price. Therefore, it was 8 vs. 70, and I think I'm going for the 70. Has anyone had a bit of experience with the 70? Any thoughts?