Used most systems over the years find Cuplok the most adabable. Have ledger sizes, 600mm, 800mm, 900mm, 1m, 1.3, 1.8, 2.5, 3m. the staircase towers are good, 4 leg, 8 leg. 10 leg. Have used it to put stairs in tank bunds where space is limited and you can put in a 900mm wide stairs onto 900mm wide towers continous to the ground. I bought a load of ledger blades and you can make up non standard ledger sizes to suit a particular problem on a job. Also find you can combine it well with T+F. The system I hate most is Kwikstage.