I'm a member too, my thoughts...
Pros
1) It's set up differently to here and as a site it isn't dedicated just to screenwriting, so if you want to broaden your knowledge into Producing, Music etc then it's a good resource.
2) So we have multiple sub forums and they just have the Screenwriting Lounge, so everything is in one place.
3) The Lounge is pretty decent for general chit chat and some pretty decent debate, does seem to be an bundance of 'wht do you think of my logline' type posts.
4) There are some industry pros who chime in, so contributions can be ery useful/interesting at times too.
5) However it's a public fourm, so there are also some opinionated trolls too... the mods do try and keep things on an even keel though but can get heated at times.
6) The site does have a jobs section, so there is a chance of connecting with a film maker, I've had a couple of shorts optioned through the site.
7) There are plenty of writers on there trying to mke it, some who have... so it can be a good place to make connections with the like minded, I've made a couple and traded reads.
There are a number of success stories in terms of members getting together to create together so definitely working for some,
Cons
1) As Dustin & Johnny mention, it's an unapologetically commercial venture so there are a lot of 'opportunities' presented, but occassionally things are free too.
2) As noted, it's more generalist than SS.
3) The site has recently had a re-design/upgrade and it now crashes my IE all the time (seems oky on Chrome) ;-(
4) Some of the trolls are downright dangerous, I've seen a couple asked to leave by mods and I've had run ins with a couple of others (and it takes a lot for me to react to such things)
My advice would be sign up and try it, if you find the commercial aspects too much, or don't like it's more generalist approach then follow Pia's lead and cancel your embership.
I might see you over there
Anthony