Just finished season 4 of Justified and, well, thought it was brilliant again. Loved this series as much as the previous two and can't really say which one would be my favourite. Think I will be watching them all again some time, but also look forward to Season 5. Don't want to say more in case of spoilers really...|
As for my thoughts on the last episode and the series in general, I thought this summed it up very well.
Warning: The link is a review so definitely contains spoilers.