The quiescent current consumption without load is less than 0.2W and is thus very good.
Exposure to the full 50W I have not done but I expect at good values actually no nasty surprises.
I must add that I also the next larger model with 60W own model: 4260393030213, which is obviously technically different at all from this 50W model. All components and serial numbers appear to be equal to a hair. But I recommend because of the guarantee no experiments with> 50W perform. One should keep reserves at the PSU anyway, therefore a continuous operation with the full 50W in this case should represent no problem.