Oh yeah, I use third party. I can't afford 60 bucks for a game system's controller, I could spend 30 on a third party one and spend the rest on an actual game that brings me actual enjoyment, over an extra cost for the system itself.
http://www.amazon.com/Xbox-360-Wired-Controller-Black/dp/B003ZSN600
http://www.amazon.com/PlayStation-Dualshock-Wireless-Controller-Black-3/dp/B0015AARJI
If you don't live in the US then... NM (but I'm sure you can find good deals like that most anywhere). XD
I have a prob with most 3rd party controllers... Other 3rd party accessories I get if it's good.
First thing that came to mind was a PS2 controller I had that was 3rd party. I got my PS2 and it came in a bundle with some free stuff, a case thing if I were to take it anywhere, a controller, and some other stuff. Well this controller was crap... buttons didn't work all the time, felt strange, and was just bad.
I've also played with other 3rd party controllers for other systems (not my controllers, but like at a friends house), I just never liked them. I was used to the feel of whatever controller and that's how it was. On top of that... some of them also had button probs.
I'm not saying all 3rd party controllers are bad... I have another 3rd party controller for my PS2, it's from the great people over at Logitech (one of my fav companies). This controller had Sony's stamp of approval so it's not like it's some random way out there brand. But I wanted something wireless and I saw that and had to have it. The thing was $40 at the time and for me as a kid that was a lot of money to put into a controller. But it was well worth it, and if I have to play my PS2 ever again then it's there waiting on me.
As for accessories such as keyboards, headsets, or HDMI cables... I'm not going to waste my money on 1st party accessories because I think most of them are over priced and most I don't like. Such as the little chat pad things for the PS3 and 360 (and yes I know about the Bluetooth PS3 keyboard from Logitech). Why would I waste money on them little things when I can have a full USB keyboard? I've got a full keyboard on my 360, and got another full keyboard on my PS3 (both Logitech).
Headsets... I would never buy a headset from Sony or MS for their consoles. Them $20 mics (I think they're down to like $5 on Amazon) from MS is 100% crap, and I've heard mixed reviews on the wireless mic (plus I think it'd hurt my ear). I haven't heard people talk about the PS3 Bluetooth mic so I don't know about that (other then it looks like it'd hurt my ear). I know Sony is coming out with
their own headset, and MS is getting Tritton to make
their own brand of 360 headsets. Personally I think if you're a big enough gamer then you need to look around for a good headset and put a little money into one (As long as it isn't a Turtle
Beach Crap headset). And not get them little ear piece things.