This thread belongs here:
https://osu.ppy.sh/forum/5Or here:
https://osu.ppy.sh/forum/13Don't expect getting serious answers when posting on OT.
Razor black widows don't use Kaih switches, they use their own razor switch.
Before I had my current keyboard, I owned a Chinese knock-off board with TCC switches that had an awful sound and it got key chatter after only about a year of use.
My current keyboard is the CM storm quickfire TK with cherry MX blues.
I've been using it for a year and a half now and it works fine. It feels a lot better and sounds a lot less higher pitched than the TCC switch. (Although Cherry MX blues are really high pitched)
So I have no problems with it and the keyboard works fine. But the Z and X key did became a bit scratchy due to overuse. They still works fine though, they just don't feel as good as other keys.
I don't know about the cherry MX reds though since I've never tried them out myself.
If the keyboard you mentioned is at a reasonable price then go for it.
P/S:
Also, Cherry MX reds are linear switches so they will feel and sound different than the razor switch, which is a clicky switch.
If you'd prefer something that feels similar, then get a keyboard that has Cherry blues instead.