I bought one recently, a K8. I was also confused, I think I had to find a reddit thread explaining what the ranges were ...
IIRC Q is the full-fat, fully programmable, hot-swappable top of the range. V is like Q but a bit more budget-friendly, may have plastic cases etc. K is their 'standard' range, some have hot-swappable switches, some don't, generally not programmable. C is budget K, wired only.
But then there's various pro, max, god knows what variants. It's a ludicrously wide product range.
IIRC Q is the full-fat, fully programmable, hot-swappable top of the range. V is like Q but a bit more budget-friendly, may have plastic cases etc. K is their 'standard' range, some have hot-swappable switches, some don't, generally not programmable. C is budget K, wired only.
But then there's various pro, max, god knows what variants. It's a ludicrously wide product range.
All I can say for sure is I really like my K8.