I have made the following commentary on another board:
No competition the APEKS is better by far in the breathing tests Ive seen plus its apparently also easy to service underwater. I think you should be comparing the APEKS to the Oceanic alpha/delta and Scubapro MK18. The mares equipment I believe would have the higher comfort level but as far as deep diving breathing there are better choices.
The headline was "mares v16 or seaquest apeks tx50 reg? "
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Both are good regs, but let her try out the mouth pieces and the feel of the reg, she may find the Scubapro more friendly ro sits better in her mouth. Let her decide its her reg.
The headline was "Apeks vs. Scubapro"
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Whats so inconsistent? And yes I like Scubapro, and no I do n't own an Apeks unit. And for your info I have used, Mares and Sherwood units. I have owned, mares, Scubapro, Sporosub and the venerable US Divers conshelf SE2 units. Maybe you need to read up a bit more.
The latest review i have seen out of a UK magazine site although a bit old places the Apeks 40 above the Apeks 100 in performance and better than one of the Scubapro units