John_B
Grasshopper
To the OP, I'm an Apeks XTX100 owner a few times over. Rather than repeat a previous post, I'll link to another post of mine outlining this problem. Part #5 is a circular diaphragm was missing in some second stages (part #6 is the actual diaphragm itself). Not to give Apeks a pass in any way on this, but I would hope everyone's LDS or internet dealer would give regs a good once-over (like mine did) before they went out the door.Just in case you decide to buy Apeks, they seem to have mis-assembled 2nds out of their doors.
You'll see in their top page "Limited recall of Apeks TX, ATX and XTX 2nd Stages." Follow the link for details.
(I wanted to post a link, but I'm still not link-worthy says the system)
Don't mean to discourage Apeks; I'm waiting for my XTX200 to arrive!
As I said earlier, I have an investment in Apeks and its just easier to have all my regs be made by the same company when it comes to servicing, parts, etc. But if I were starting all over again, in addition to the Apeks XTX100/200 I would seriously consider the Scubapro MK17/G250V.