I have a bunch of the G1 ones from when they were out here. I don't think I have a full set, pretty sure I don't have Mainsail and maybe not Princess Amethyst, who actually I don't want on principle because the leaflet calls her Sparkle. They are adorable and such a cool idea. I don't know why they happened but I'm glad they did.
Also I find it odd that Mainsail was part of this set
Because when you think of iconic G1 ponies, you think of her...? Really? xD
Mind you my sister had her, so she was kind of iconic in our childhood...mostly from being dangled out of windows on shoelaces to make the hair turn.
Congrats on your new additions