None.
Cons: What the specs don't tell you is this drive is apparently an "SMR" or Shingled Magnetic Recording drive. The 256M of cache is used as a selling point, but it's in fact to cover up the use of SMR.
To put it simply, on SMR drives, writes to the drive are destructive to more data than the currently written data, which means the drive has to write the destroyed data back to adjacent sectors in addition to the current sector. This has a massive performance impact, hence the 256M of cache to try and buffer longer before the drive falls flat on its face. I/O on small files cripples performance on this drive, as does random I/O because the cache effectively becomes useless. This also means that in the event of a power loss during a write operation, you can expect massive data corruption to random data not associated with the current file being written.
These drives are not advertised as having SMR, and I had to learn the hard way how garbage SMR drives are. I was wondering why performance on this drive was so bad and why my Linux server kept locking up trying to do anything on it. Any operation reading or writing to it causes the machine to hard lock with a solid disk activity light for minutes.
Overall Review: Deceptively advertised drive, will not be buying any Seagate products for the foreseeable future.