Yes. Finally. After a year of development, 1.8 has finally gone stable. The main major feature added is Teredo and IPv6 support, but there's a slew of smaller features, changes and improvements. The changelog is absolutely massive, so check it out down below.
For those with "HTTP 400" error, that is a problem with NOD32. Please disable IMON or upgrade to 3.x.
Other major features are bypassing the Windows system cache (see the Disk Cache settings), significantly improved proxy support, and magnet URIs.