i'm an output addict. to clear up some fuss and fanboyism
Bluefield is a sensor standard. it tracks well on most surfaces, so long as there is no bumps and stuffs. There is at all, no need for mats as long as not all of your house items are made from glass
Darkfield is the latest sensor standard on the consumer market. i generally tracks on any surfaces even on glass(must be 4mm thick, but i managed to track on light reflecting surfaces 2mm thick with only minor jittering with my friend's anywhere mouse)
why razer IS NOT a general wireless mouse
i) laser sensors are supposed to be PRECISE. razer mice DOES NOT track precisely without surface(confirmed with my friend's lachesis, lots of jitter above 3k DPI, dunno if it is fixed). orochi also does not track properly wirelessly according to some source and this is even agreed on your razer thread

ii) they have no low end wireless product. wirelessly speaking, RM150~ is considered a good low end solution

iii) logitech>razer in the general market. if you disagree, this proves that you are a fanboy. go check your razer thread on just how much RMA issues there are as well as faulty products. my friend had his 1 years old g5 damaged, sent to RMA, and got a brand new g500 instead.

iv) logitech has advantages with the unifying receiver. you can have all your output hardwares wirelessly connected with just 1 receiver. and i dont consider mamba's big wireless receiver a potent competitor.
my answer is more logitech oriented since i know more about logitech's solution. but currently i agree that logitech's darkfield costs too much. a standard microsoft bluefield is good enough IMO, unless you want gaming grade. g7 is a good wireless gaming mouse but i've heard battery issues.

it is wireless?