I don't personally have one, but back on /r/budgetkeebs they were considered a perfectly reasonable brand for first keyboards and modding candidates. Reasonable build quality for the price, many of them hot-swappable (though double check that hotswap socket type before buying your new switches). What you won't get is QMK levels of customizability or meticulous attention to detail in regards to sound or build quality.
Honestly, even a no-name FIlco-knockoff 104-key gamerboard with rainbow LED and generic blue or brown switches is a step up from most membrane keyboards; the bigger issue with a Red Dragon is that you won't stop there. :-)