I would like to share my experience and observations regarding this.

First of all, from what I know the local companies that offering this Trainee Drilling Engineer are UMW and Perisai. I'm came from one of them .

From my observation (local companies), yes, the training is to develop you to become a rig key personnel i.e. Driller, Toolpusher, OIM etc...Is it advisable? I would say yes because you will work as a regular roustabout, roughneck, etc etc....and will know well about the rig equipment and operations. First hand experience!

For some of the international drilling contractors (Transocean, Seadrill, Ensco, Diamond etc), they have different programs, either to develop management positions (rig manager, asset manager, subsea supt) or specific rig positions program (Driller, Subsea Engineer, Mechanic, ET etc)

In near future you want to switch to become drilling engineer (operating company/office job)? Yes I saw some of the trainees (international company) made that switch after a few years doing rig jobs (still in the program)...But, I never saw a guy completed his/her training and become a regular Assistant Driller or Driller switched to become Drilling Engineer. They already have fix rotation job with 4weeks on and 4weeks off (fully paid). Some of them that I see will progress up to become OIM or Rig Manager(office job) or another rotation jobs i.e Drilling Supervisor (operating company) or Directional Driller (services company).

So, for the start it is a good exposure and experience to start working hands-on in this trainee program if you are  good with physical jobs and know how to be good with people around you (friend/networking).

Later on, along the way the process you might have a better view or a better choices...

You're right about The Driller Trainee Program in Maersk Drilling.

One thing that I should highlight, there are differences between Trainee Drilling Engineer in operating company compare to drilling contractors. From what I know, operating companies will give their Trainee Drilling Engineers/WellSite Engineers some periods of time to work on the drilling rigs maybe 6 months (maybe more or less) and then will stay in the office. The DE with the team onshore will plan the wells and come out with the NOOP, DWOP, Pre-Spud meeting and so on..During the execution of the drilling program, the onshore team will constantly monitor the progress and liaise with the companyman(Drilling Supervisor) onboard.
TDE in drilling contractors is the one who physically works onboard 12 hours a day, 7 days a week depends on your rotation for how many weeks. Your are part of the team that executing the drilling/workover operations based on what has been planned on the table. Everyday (if you are driller), you will receive the Standing Instruction on what to do for that well section. 

Having said that, if your are with drilling contractors for let say, 3-4 years (maybe you are doing Assist Driller) and want to switch to become DE, I'm not pessimistic but maybe not that easy because you have to compete with fresh grads, also if you with them from the start, you already designed a few well programs and about to become Sr. DE.

One more thing, please note that Fast Track Program in local companies not that 'fast' as you think. Just beware.

i bought mine at ampang mall (ampang park)