It's the only major type of lock I haven't been able to pick within a reasonable timeframe.
Normally once you learn how to pick a certain model of lock, another lock of the same model will fall within 10 min, broadly speaking, and most cheap locks in just seconds.
Disc detainer lock's design just prevents you from freely accessing each of the discs except with specialized tools, and there's no feedback from any spring, so there's no "touch" or "feeling" you can learn.
That leaves to brute force all "combinations" from the innermost to the outermost disc as the only way to pick it.
In a 8 disc, 4 "angle" lock like the one I have to practice, that means 4096 combinations. With a very optimistic 1 sec per combination, on average you need 34 minutes per lock.
At that point it's less suspicious to use a drill or an angle grinder to open what you want to open.