Oh well, first it's much more of a nostalgic feel since I happened to kick in when it was booming... However it depended on who because there are some I liked (Haku, Meiko Sakine, Kagamie Kawaiine and Tako Luka being the most predominent, Sai Tonarine as well since she was neither a vocaloid or an actual pitchloid) and others I didn't enjoy much or felt neutral (I didn't like Neru and the Shion brothers were fun in the beginning but quickly it went over the top)
I even surprised myself at creating two Pitchloids that I could finally do while owning the banks, one being Cosmos (from galaco prize and if I was having her NEO, I would make configs for the NEOs as well) and Maria Gloria from TONIO's voice by messing around with the parameters... Moreover, while trying to create some tones for TONIO I decided to produce different variations for her, and I even remember once I've created a very darkish tone on galaco by accident and just labeled it as "True Noir" (pun with "really black/dark" and trou noir that means black hole ) then imagined a bitter character out of it though it never got really much of an avatar, unlike the two others...