I have two Logitech G700 mice, and they work fine. I have noticed a bit of the textured surface coming off, but it's not a huge deal. I also see some weirdness when I use wireless, but I think that might be related to the receiver being very close to my wireless router. To note, I use my G700 with two PCs. I use it wired with my desktop, and wireless with my work laptop. So, wireless isn't my ideal setup for this. The only bad part about the G700's cable is that it's kind of thick. Also, I do not use Logitech software. I've never seen it as very good, and I'd rather keep it off my PC.
As for WiFi, you have to keep in mind that there are many variables that can modify how well it performs. First of all, the numbers on the box? In most cases, they're a pipe dream! First of all, just to be clear, let's just state that those numbers are bits per second not bytes. Second, those numbers are based upon the absolute max that the router supports. For example, a 600Mbps 802.11n router actually supports 4x transmission; however, if your wireless device doesn't, you will never get that speed. In my experience, most laptops support either 1x or 2x receive (note: transmission on the router correlates to receive on the device), which means you're limited to 150Mbps or 300Mbps at best.
There's also the switch over to 5GHz that can make things worse. I know, I know... everyone stated that 5GHz is better than 2.4GHz, and it does have some advantages as we greatly saturated the 2.4GHz frequency. However, higher frequencies have one inherent downside: worse transmission through physical objects (i.e. walls). One thing that most people probably don't realize is that this is one of the reasons why Verizon's LTE service is usually a bit better indoors (albeit, tower location trumps all factors). Verizon won the 700MHz spectrum auction where as AT&T typically operates on the 1700MHz and 1900Mhz spectrum (note: Verizon does use it a bit as well). I recall reading an article a few months ago where some cellular provider (I think it was T-Mobile) was complaining that Verizon got too much of the prime spectrum when they won the 700MHz spectrum auction.