As a model I have to say I used to ahve one,it was cool design but I didnt had too much traffic on it ye very few job messages I had one but not interesting. Its difficult to keep your site updated if you dont know about flash etc so my MM profile is ok I can show my best pictures its a quick link to submit my pics. It may not look that profesional but at least I can keep it updated and not depending on anybody else,I can tell you it was frustrating.I rather ahve my MM profile than a dead website.At the end your work speack for itself so no matter how good or profeesional the website looks if your images dont reach profesional standard anybody would tell you're a "wannabe" that has a website up(something that anybody can get for free). SO nowdays I dont think it says too much about your profesionalism. Anyway if you got good work and a cool designed website its more enjoyable but not the reason why you'll get an asigment I think.There are more ways to show your profesioanlism mainly your work, the way you aproach clients,education etc..