Arbitrum has established itself as one of the most successful Layer 2 solutions in the Ethereum ecosystem. It delivers on its core promise: meaningfully cheaper and faster transactions while inheriting Ethereum's security guarantees through optimistic rollups. The developer experience is strong—deploying existing Solidity contracts is largely seamless, which has driven impressive ecosystem growth with hundreds of DeFi protocols, including major names like GMX, Aave, and Uniswap. The introduction of the ARB governance token and the Arbitrum DAO added decentralization, though governance participation remains modest. However, the sequencer is still centralized (operated by Offchain Labs), which is a legitimate concern despite plans for decentralization. Fees, while much lower than Ethereum mainnet, can still spike during high-demand periods and aren't as cheap as some competing L2s. The optimistic rollup design also means withdrawals back to Ethereum mainnet carry a ~7-day challenge period, which is a real UX friction point. Overall, Arbitrum is a mature, battle-tested L2 that I'd recommend for most users looking to use Ethereum-based DeFi more affordably.
Largest L2 ecosystem with deep DeFi liquidity and protocol support Near-seamless EVM compatibility makes developer migration easy Inherits Ethereum's security model through optimistic rollups Active governance and growing decentralization efforts Centralized sequencer remains a single point of control 7-day withdrawal period to Ethereum mainnet creates UX friction Fees can still be notable during network congestion compared to newer L2s