They look and sound great when you have the whole set on the stage at Club LOL, and they represent a significant achievement in time spent working at the cafe.
They're the only set of gyroids that I've kept. The others just get sold, recorded only in my catalogue.
Sputnoids are my favorite. I like the variety of noises they make, although I wish their sounds would go along with music like they did in the previous games. Quazoids are my second favorite.