I just got a Razer Lycosa today:
I've been using a G15 v1 for a while now, but decided to try the Lycosa for a couple of reasons:
1. it's smaller, and can fit more easily on the desk
2. curiousity. I just wanted to try something different.
Anyway, the features of the Lycosa include:
* backlit keys (you can turn it on for only the WASD keys)
* 1000HZ polling rate
* slim design
* touch sensitive media buttons
* nice look (the full picture at the top doesn't do it justice)
* key macros
* USB extension - the keyboard comes with two USB plugs, one is for the integrated USB port. I'm guessing this is to avoid the latencies and/or bandwidth of two devices sharing one port.
* mic and headphones extension - the Lycosa's cable also has 2 x 3.5mm plugs for headphones and a microphone
My experience with the Lycosa so far:
The keys do have a nicer feel to the G15 keys.
Before using it, I was skeptical whether the 1000HZ polling rate would make a difference with a keyboard. It does. The Lycosa feels more 'instant' and responsive to key presses than the G15.
When I plugged my headphones into the headphone port on the Lycosa (a pair of Audio Technica ATH-AD900's, combined with an Asus Xonar D2X), I noticed some background noise that wasn't there before (even with nothing playing)
So I plugged the headphones directly into the sound card again, and it was gone.
So it seems the Lycosa's headphone extension picks up interference.
This might not be noticable with the basic headphones most people get, combined with onboard sound. But for audiophiles, it's a real turn-off.
But, you're not forced to use it anyway.
When using the Lycosa, I do miss having the information the G15's LCD provides, as well as the 'g' keys which you can assign macros to (though the Lycosa has its own macro functionality which I have yet to try)
However, it is a smaller and lighter keyboard, and you could potentially complement it with a Logitech G13 to get an LCD and 'g' keys to assign macros to, though this option isn't cheap.
Bottom line: So far I'm happy with how this keyboard works. It's small (compared to my G15), light, very responsive, looks nice, has backlit keys and media keys. It lacks a couple of things the G15 has, which some people wouldn't live without. But all in all, I would recommend this keyboard.