Hey, been a lurker here for awhile. With our group changing from DW campaign to a BC for various reasons (Gm didn't have enough time, SM flat as protagonists)
On to the problem:
Although we haven't yet had our first session, from looking over the rules the powers of warptime and shattertime are a magnitude above everything else. They basically make the psyker superior in combat (depending on weaponry, etc) to any other class. The problem is that they provide too great a benefit without enough risk.
Shattertime is more excusable as you have to pass on becoming aligned which is quite a large penalty, especially for a psyker, but warptime even using it at the unfettered level when you first get it puts you at unnatural of 4. Any problems with hitting are removed by casting precog strike too.
Our GM current plan I believe is to modify warptime to 1/2xPR which means you at least have to cast it at push to get a massive benefit out of it (which is the aim), but I was wondering if anyone else has had problems or has good ways to alter either abilities.
P.s. I reaaaaally love the flavour of the skills, and was hoping to be able to build something similar as soon as I heard that some powers sustain as free action.