My 4.3 is very solid and heavy.
High-capas probably have more aftermarket parts available for them then any other pistol, so finding new or longer barrels if you want more acuracy shouldn't be an issue.
Personally? i find it very acurate. That being said, i have only ever used 3 or 4 GBBs, all of them TM.
I'm sure ILLusion, or one of the other pistol-masters will chime in soon, but trust me, TM high-capa = awesome pistol
It's better to light a candle, than to curse the darkness