QUOTE(Epion @ Nov 27 2015, 15:23)

From what level (or drops training level) do you guys suggest to start playing the DwD at PF?
Never?
Actually depends on the clearing time and your stamina level, last time I tried I managed to clear DwD in 40 minutes thanks to Reloader usage.
Problem is, in 40 minutes I can do 100 rounds arena, 90 rounds arena, 80 rounds arena, 75 rounds arena and 70 rounds arena, gaining more exp and better drops.
Unless you want to optimize for exp/stamina I would say it's never worth it.
If the question is when you should switch from IWBTH to PFUDOR I'd say it's always better to do it in PFUDOR, if you start the rounds with OFC leaving only the SGs alive DwD shouldn't be more difficult than the other arenas.