VUE was really "happy", clean. Sans-serif fonts. Cool colours. Funny design like a HP logo and on/off button on the dock.

IBM made it super suit and tie. Geriatric colour schemes with dark colours, formal serif fonts and anything cool removed.

Functionally it was the same (even two or three features were added) but it went from "designed for people" to "designed for business". Like everything that IBM got their hands on in those days (these days they make nothing of consequence anymore anyway, they're just a consulting firm).

It was really disappointing to me when we got the "upgrade". And HP was really dismissive of VUE because they wanted to protect their collaboration deal.

I think 10.30 was peak HP-UX. 11 and 11i were the decline.