I have been a member for three years out of Freeport Long Island. There are 6 locations here covering Long Island Sound and the South Shore bays. I absolutely love it, it's a perfect fit for my wife and I ,and 2 young boys. It is NOT the "boating life" that many on this site get to enjoy, but it does give me an opportunity to get out on the water 20 times a season with my family....I'm not exagerating 20 times each year is my average (Beginning of May thru end of Oct). I can't speak for other locations, but here in NY availability is not a problem for me. I go out most weekends, and weekdays are always wide open. In the summer my wife and I usually leave work early on Fridays and get somthing for an afternoon with no problem. You have an allottment of advanced reservations to use for the website, but you can also call that day to see whats available. Chances are, something is available at one of the locations, and since each one is within an hour drive, I am more than willing to drive to any of them for 5 hours out on the water (you reserve either a morning or an afternoon in 5 hour intervals). You can make arrangements for full days for special occasions, but that is on a limited basis. However your 5 hour slot is 5 full hours on the water. Throughout my membership there have only been a handfull of times when I wanted to go out on a weekend and nothing was avaialable (so we go to the beach instead). I have a Memorial weekend reservation, and I fully expect to be out over July 4th and Labor Day. Also, when i go to Florida on vacation, they always set me up down there. I've gone out of Sarasota twice, and this year 2 days in Tampa Bay in March.
However I have been shut out by weather more than lack of availability. If I have a reservatin for a Saturday, and it rains on Saturady, chances are I might not get to go out on Sunday when it clears up. Also, no boats go out during a Small Craft Advisory. So I am more at the Mercy of the weather than if I owned a boat because I can't just go out tomoorow instead.
As my kids get older, I fully expect to buy my own boat so that I too can live the "boating life", but this is a very excellent fit for now, money well spent. And having used such a wide variety of boats, I'll have a much better idea of what I want or need in a boat when I do get my own.