I have "only" lost about 100, but still have about 20 to go. I am a somewhat skinny fat so when I look in the mirror I don't fully notice the change to my body.
But man, when I run in to people who I haven't seen in a few years they are like DAMN! Which is fun.
Also, I am just flat more active now. I hate just sitting around the house, or a vast majority of the things that I used to enjoy doing, such as playing video games 6 hours a day and watching TV the other 6.
And lets be honest here, I am sure everyone has their reasons for losing weight, and did it for themselves and blah blah blah, but I assume for young males a large reason in losing weight is to get the girls.
In this regard it has helped tremendously. Somewhere in the last 20 lbs or so the girls really started taking notice which is great.
I deal with some lose skin issues, and definitely don't look great with my shirt off, but clothed I look pretty damn good. My experience has been that usually a girl, no matter how hot she is, is at least as self conscious about her body as I am about mine so its a wash. Furthermore, once you both are naked and in bed, its kind of past the point of no return, lol.