Kotobuki Securities offers some significant advantages, including its regulation by the FSA, providing a trustworthy and secure environment for trading. Additionally, the firm provides a wide range of traditional investment products, such as mutual funds, IPOs, ETFs, and REITs. However, there are some downsides, such as the lack of a demo account, limited transparency around trading fees, and the absence of forex, commodities, indices, or cryptocurrencies. These factors could limit the platform's appeal to more active or diverse traders.