MHSSC is the most legit camp out.
I did camper staff last summer and it was the sickest thing ever! I paid to be a camper for two weeks (split it with my parents), and then I got two weeks to be camper staff. If the rules are the same as last year than it means you can be a camper-staff member (do the dishes, bitch work, which is worth it for sure), for each week that you pay to be a camper.
But the only thing is that if you haven't been there before I don't know if they will allow you to work; this is a more low-key operation so they like to make sure you aren't a total shit-head before they allow you to work. But if you come as a camper and make a good impression, and they have a spot free, they MAY, may, allow you to stay on as camper-staff.
As far as facilities it's super legit, the tramp is just as good as the Windells tramps but there are a lot less people and there is a sick throw pad that staff can throw under you when you try new tricks. There aren't all of the activities like there are at Windells, but in my experience (I went to Windells a few years back), I just tramped every night until it was dark, and then just slept cause I was so tired haha, so I didn't even have time for a huge skate park or whatever.
The coaching at MHSSC is 1000x better than at Windells. I went to Windells and my coach (not naming names), just ditched us and skied on his own. I know that some of the pros at Windells will actually work hard at coaching you, but I have heard more often than not about experiences like mine.
All the coaches at MHSSC are super chill and love to help you learn new stuff, and no one there is a dick if you're just learning. And the on-hill park is super sick. If I were you I would go there in late June or July because the snow line goes all the way down to the bottom chair and you can do these super laps where you go from the top of the ski area through the MHSSC park and then through the public park (which is sick too btw), and all the jumps are big and sick and the rails are dope too.
Basically, if you love skiing and doing stuff like tramping that has to do with skiing, then you won't miss anything about Windells and you will be able to go 2x as long for the same amount of $.
The only advantage Windells has is if you have unlimited $ and you really want to skate and just do other stuff then tramp.
GO TO MHSSC!