I own quite a lot of mechanical keyboards from different brands (Filco, Ducky, IBM) and switches (MX blue, MX black, MX green, buckling springs ...)
The Realforce 88UB has instantly become my favorite keyboard.
The build quality is excellent and the PBT keycaps are a such a pleasure to type on.
The 45g Topre switches are just perfect, even if you're used to heavier switches. I would definitely recommend this keyboard to all searching for a solid keyboard with TKL form factor.
Unfortunately the black on black dye sub letters are hard to read. If you really need to see the legends in low light condition - this keyboard is maybe not the best choice. Most probably you won't even find any ISO replacement keycaps for Topre switches.
Otherwise - if you're ok with touch-typing - don't hesitate. I haven't regretted my purchase at all. This black beauty is really far beyond expectations.