Yes they check out these forums. At least the smart companies do. I'll tell you why I know.
I did some work for a pretty large Palm OS site. Years ago (dear god, five years ago now that I think about it), Sony came out with two new Clies called the NR70 and NR70v with portrait folding clamshell designs, digital cameras, keyboards, giant 320x480 screens with virtual graffiti, MP3 players, MS expansion, and the fastest processor available (66 MHz Dragonball SuperVZ) with the most RAM possible at the time (16mb). When the article came out announcing these new monsters, the site was SWAMPED with hits. The server hit redline and saw 100%. Comments to the news article started racking up in the hundreds, so the site owner disabled viewing/posting comments to save bandwidth on each hit. He soon got a call. It was Sony USA, requesting him to turn comments back online. They wanted to read as much feedback as possible!
True story. And if Apple was smart, they'd be doing the same thing Sony did five years ago.