Ayisha
Contributor
Huh. First I hear of Fundies tech pass in 50s. Or instructors using them. That is encouraging as I've little interest in fighting top heavy doubles. Pages 2-3 of this thread suggested against that. Doubles setup recommendation.
LP50s make sense for the basic skills, and team stuff. Requiring a size as 'gateway to further classes' would not seem to make sense if it still allowed say twin AL80s, as they are light and balance should be much easier. Requiring mastering rather negative doubles would make sense for 'gateway' to huge tanks, but no one has quite expressed it that way.
Here's GUE Instructor Bob Sherwood wearing his double 50's while teaching Tech 1:
Here's GUE Instructor Heison Chak wearing his double 50's:
They regularly use their double 50's while teaching and sing the praises of double 50's for how well they trim out and how easy they are to carry. They routinely recommend double 50's for me or anyone who has a very low SAC. I know lots of GUE Tech 2/Cave 2 divers who use them with stages. They also suggest an extra AL 80 with a transfer fill whip on the boat/shore for transferring gas between dives if necessary.
Personally, I think they're fine as long as you're using stages, otherwise they're not that conducive to regular length second dives while maintaining minimum gas.