I'd never heard of the SMB course, so I googled it.
From
PADI SMB Speciality
What will I do?
The course consists of a knowledge development presentation and 2 open water dives which will cover:
?Why use a DSMB / SMB?
?Tides and currents
?Types of Surface Marker Buoys
?Types of reels
?Methods of delayed SMB deployment
?Risks and hazards of SMB use
?Preparing the delayed SMB for use
How long will it take?
The course consists of an evening of theory and pool work follwed by two opne water dives
(I left the typos in to demonstrate the attention to details)
Knowledge development, really? Personally I think it is a bit of overkill. But, it does allow Padi to take their cut for preparing the course, the LDS for providing a 3 hour chat about cool dives the instructor has done followed by administering the test and then of course there is the
2 open water dives.
Personally, I'd ask a friend to show me if I was unsure after my advanced course. What I would really prefer would be to pay an instructor to dive with me and show me but I really get the impression that Padi doesn't allow that.