This is very subjective, the domain is incredibly easy to remember.
My guess is it is probably your age as older people do not use terms such as this.
Young people do, a LOT.
In addition this site would be targeted naturally at young people, I mean the demographics of viral sites indicate a very young audience.
In terms of pronunciation it is the exact same as the word seriously except with a Z, I fail to see how that is hard unless you are vocally challenged. Also the day has yet to come that we have to talk to a computer unless you are handicapped (again not our target audience) or rely on spoken word of mouth as the primary way of spreading your name.
Please stick to factual instead of subjective arguments if possible.
Carry on.