| Feature | v2.3 Pro | v3/v4 | |---------|----------|-------| | Unbuffered I/O | ✅ Yes | ✅ Yes | | MD5/SHA1 verify | ✅ Pro only | ✅ Built-in | | Modern UI scaling | ❌ Fixed | ✅ High-DPI | | Cloud (Google Drive, S3) | ❌ No | ✅ Yes | | Portable version | ✅ (single EXE) | ❌ (installer only) | | Explorer integration | ✅ Lightweight | ✅ But slower |

| User Type | Verdict | | :--- | :--- | | | The free version (no verification, limited sync) is likely sufficient. | | Photographer / Video Editor | Pro is mandatory. Verification ensures your media assets aren't silently corrupted. | | IT / Sysadmin | Pro. The error logging, sync, and command-line support are non-negotiable. | | Data Hoarder | Pro. Moving 10TB+ archives without checksums is reckless. | | Small Business Owner | Pro. Saves hours of retransferring failed backups. |