I feel I should come out of lurking and comment here since I have actually owned this piece of gear and can offer some useful advice.
In all honesty, think about exactly WHAT you're going to be carrying and choose a rig that way. Carrying a shitload of CRAP on yourself ain't going to make you a better player. Sure, you'll look real neat in the staging area but.....well you get the point. If you don't need it, dump it. Think it will look cool on your gear if you carry it? It won't. Why? You'll be the first one hit because you're so damn slow muling it around.
Anyway, bought a Weesatch, thinking internal mag pouches would be cool and all. Sorta liked it 'cause of the modular pouches, but in fact, you end up wasting like fucking $300 more on the pouches than anything. Played a few games with it, didnt' like it at all. The rig just doesn't stick onto your body plus it's extra nylon weight.
Paraclete RAV or the Eagle CIRAS is nice and all, but then again, in airsoft, when do you need it to be QR?
The Eagle plate carriers, BHI STRIKE, or Eagle MLCS aren't terribly bad, but again, modularity = cool but also = more money.
If you're going to be carrying just mags straight up, and a few pistol mags on the side and maybe a small utility pouch, you can do what I did, get the Eagle SF chest rig, send it to Tiger Tactical, tell them to rip out the side utility pouches and add PALS webbing. BAM!! Instant modularity with the ability to carry up to 12 mags in a rig that sticks to your body, open at the back (so you have an option of hydration pack or not), as well as being overall very light and comfortable for the duration of the day/scenario.
But, to answer your question about the Weesatch, what Jeff/Shinjit said was right, it does sag quite a bit at the front even with a hydration pouch in the back, and it isn't very ROUND so your water kind of ends up sagging and you get a big jelly lump in the small of your back. Internal mag pouches are a pain in the ass, unless you wear the rig loose, in which case the rig feels like it just hangs on your shoulders and ends up being more of an LBV than anything.
The construction of it, however, is rock solid. HSGI is quality. Period.
Oh... and hey, did I mention that I have a spare set of OD shoulder pads for it? =) PM me if you get the Weesatch and want those cushy shoulder pads.