Thinking of buying 3 Razer products... can any owners of these give me their thoughts?

Hey guys, I asked for a bunch of computer hardware for Christmas, but my relatives put their funds together and gave me some cash to buy the peripherals I want instead. I've always liked Razer as a company, and a lot of the stuff currently on the market sounds really cool. Here's what I'm thinking:

• Razer Mamba as a mouse. It doesn't have a weight system, and that makes me a little nervous. Wireless mouse with a 1 ms update is a plus in my mind. I tend to be a lower sensitivity gamer.

• Razer Blackwidow Ultimate keyboard. I love the fact that it's mechanical and relatively compact, without a ton of annoying media buttons. Macros are a plus, but they're relatively minor for me.

• Razer Megalodon headset. This thing looks awesome. 7.1 surround sound with its own sound processing unit. A lot of people say it's extremely comfortable. I'll probably only have the cash to get this and either the mouse or the keyboard, but I think this is what I really want out of the three.

So, can any owners of these products let me know how they're working out for you? Are there known issues that have popped up for you or someone you know? Are there better and/or cheaper alternatives to the items I'm thinking of buying? I really appreciate your input in advance - it's not every day I get to spoil myself with fancy new shit.

Edit: I pulled the trigger on all three, since my source offers a free one year warrantee and matches prices minus 25% (saved $70!). Thanks so much for all your help, and happy new year.