I've only used the keyboard in wired mode and therefore am not aware of any possible issues with wireless.
I've been using the keyboard for the last couple of days and am very impressed with the quality of it. Albeit I haven't used that many different mechanical keyboards in my life and never a gasket mounted one the RD75 is the best keyboard I've ever had by far.
I ordered the anodized silver model. It arrived very quickly as I've ordered express delivery, the keyboard itself arrived in good condition, the keyboard box was put into another box and it had a "do not throw" sticker.
Inside the box there were additional keycaps (cute panda keycap was among them), some white and others of other color, keycap and switch puller, user manual and a generic non braided cable. For me, the non braided cable is the worst thing with this keyboard, but you don't have to use the same cable the keyboard came in so it was not a big issue.
Keyboard itself feels great. It worked right out of the box, didn't need to press anything or do anything, except plugging it in. The full aluminum case is heavy and the keyboard itself feels sturdy. The keycaps look and feel great, the typing feel and sound are really good also. I didn't find it too loud or too difficult to press or anything like that.
The RGB is really solid in my opinion. It doesn't shine through the keycaps but there's just enough of it to look really stylish. Someone else might find the brightness lacking, but I found it bright enough.
VIA connectivity is really helpful too, being able to remap any button you want, create your macros, manage RGB, media keys etc. to your own liking is a big plus.
It's also really easy to disassemble it if you want to make any changes to it.
Overall, this keyboard is great for anyone. Whether you're just getting into keyboards or want to start playing around with mods or tinker with gaskets, foams etc. or you're someone who wants to buy a quality keyboard and forget about it, this is a solid choice that I can recommend.