My opinions:
I own and dive SP's MK5/10/15/20/25s Balanced Adjustables,G250/500/600s, Atomic B1s/Z1s, Apeks TX100s,DS4s and Poseidon Odins/Jetstream/Cyklons. All have their ups and downs, their quirks, advantages and disadvantages. They're all great regs, and to tell you the truth, they...