Very, but there's a reason for that: It takes a real lot for me to call something my "opinion" or "conclusion". I need to have plenty of evidence and back-up information and whatever else it takes before I'll feel confident in calling my take on one matter or another "my opinion". In other words, I have a really high bar for calling anything my "opinion", rather than expressing whatever I'm "leaning toward thinking" as "I think there's a good chance that..." or "I may be wrong, but....".
That means my opinion is either well informed and backed up, or else it's a matter of a personal preference (like, "I think mauve is the prettiest color). My preferences may change over time, but unless/until they do; I'm not going to change the opinion that mauve is a pretty color.
So, having explained all that: I'm pretty darned attached to my opinions (but mostly because before I'll pass them off as "opinions" I need to know they're not just my "opinion". :)