Got myself GK61 wireless and so far i'm very happy with it. I don't wanna change much in terms of layout and lightning effects so i'm just using it stock for now. The keyboard arrived very quickly and is of very good quality, especially for that kind of price. I'm not into hardcore mech KB modding so I'm def not gonna be as picky as some other people I'm sure, but the glacier brown switches are good enough for me. It takes some time getting used to but it's plenty good for what I need. I thought it'd be a bit more silent but that's not exactly an issue. I wish they would advertise on what kind of use they recommend each of their key for.
I had no trouble connecting my wireless KB to my computer using a Bluetooth dongle (I used BT 4.0 not knowing which one the KB supports). Without having to install and use the software I can easily switch between all premade functions on the KB and that is great, no complaint regarding that. The KB cable is okay, not the best but it's still plenty good yet I wish they'd offer different colors to go along with the KB.
Overall very happy and recommend it ++
:-)