Thing is 30 inches is not a big pow day here in Japan. While a Turbo dream or any twin tip with a decent amount of rocker does well in 30 inches they won't do very well when 30 inches fall for 3 or 4 days in a row which is not uncommon here.
The concept of a powder board here is a little different.
I ride mostly a twin tip with rocker not that different from the TD (now a proto but I was on a ride highlife before), but when it gets crazy deep I borrow a powder board (now I have a swallow tail so this year I should be sweet).
If you have lots of experience with powder its doable with a twin tip even when its super deep, but its just not as much fun. You have to work very hard and if you do get stuck its a nightmare.
Almost every serious rider I know in Japan has a designated pow stick (ie directional, usually with a wider nose and a lot of rocker.
Anyone coming here for more than 1 week I would say its a very worthwhile investment.
@cjcameron11, if you have the means get something more pow specific. Your Bezerker will be fine if its not super deep but if you get a big dump it'll struggle at your weight IMO.
One option is to test out a gentem stick for a day if it gets crazy deep.
stick : GENTEM STICK
I believe they will give you one for a day without much hassle (Niseko).
They also rent good quality powder boards in Japan so you could get one as needed depending on the conditions.