请问HN：关于爱沙尼亚电子居留和经营爱沙尼亚OÜ（有限责任公司），你有什么惊讶的地方？
根据网上的官方信息，加入电子居民计划并在爱沙尼亚注册公司似乎相对简单。我正在考虑使用爱沙尼亚的OÜ来开展SaaS业务，想听听那些实际经历过这一过程的人的意见。
成为电子居民并建立公司后，有什么让你感到惊讶的？是否有反复出现的费用、合规要求、银行/支付问题、税务复杂性或其他你未曾预料到的运营挑战？
远程运营公司有多容易？你是否曾需要前往爱沙尼亚解决问题？
回想起来，你还会选择这样做吗？在开始之前，你希望自己知道些什么？
我非常感谢现任或前任电子居民分享的经验教训、注意事项或建议。
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From the official information online, joining the e-Residency program and setting up an Estonian company seems relatively straightforward.<p>I'm considering using an Estonian OÜ for a SaaS business and would love to hear from people who have actually gone through the process.<p>What surprised you after becoming an e-resident and establishing your company? Were there recurring costs, compliance requirements, banking/payment issues, tax complications, or other operational challenges you didn't anticipate?<p>How easy has it been to run the company remotely? Have you ever needed to travel to Estonia to resolve an issue?<p>Looking back, would you do it again? What do you wish you had known before getting started?<p>I'd appreciate any lessons learned, gotchas, or advice from current or former e-residents.