The neow3j SDK and compiler have been a success. They are being used by crypto exchanges, like Binance and OKEx, Neo-native projects, like FUSD (Neo Stable Coin) and cNEO (Neo Compounder), and in of AxLabs' own projects, like GrantShares. Repository statistics tell us that the SDK is downloaded approximately 6,000 times per month on average.
The positive impact of the neow3j SDK and compiler on the Neo ecosystem is clear. They enable Java, Kotlin, and Android developers to create dApps on the Neo platform, effectively expanding the developer base. By offering a familiar development environment and preferred programming languages, neow3j attracts new developers and facilitates the creation of high-quality Neo dApps.
Some other impacts that neow3j has:
The SDK serves as a reference implementation for a Swift SDK
Neow3j provides detailed documentation that helps understand general concepts about the Neo Blockchain
The project lead to many discussions on the design and feature set of the underlying Blockchain itself
In summary, neow3j is a valuable addition to the Neo ecosystem, is easy to use, well documented and has proven to be reliable and secure.