I see their point, however...
I dont think I could afford the 5 days off from my "existing" role just to be on trial at a new place.
I understand the rationale for this type of evaluation, and is more effective than a 60 minute session where one can say any sort of shit that they like to get past and as such hired, but then again, isnt that why companies have a six month (or whatever) probation process, in addition to performance reviews?
On another note, I was interviewed by Facebook (yes, THAT Facebook) for a role a while ago. I was in the States and went through the most intensive interview process ever, it was a multi-hour process with about six different interviewers all putting you through the wringer, both technically and HR-ally (I made that word up, deal with it). I see the merits in this process too however by the end my brain was about as much good as Annabel Chong's vag after her little escapade in 1999.