I went for 5 days back in 2012 and then another 5 days back in May this year and I'll be back in a months time for another 5 days. First time as a tourist but the next two times for work.
Things have changed massively since 2012 but the first time around people looked pretty run down in the countryside and also in some areas of Pyongyang. Things have improved a lot though.
Food was rough first time around but now it is really good in the restaurants they let foreigners visit. I actually enjoyed the food in Pyongyang more than what I got on a recent trip to South Korea.
I paid about £650 for the first trip from Beijing.
** no business promotion **