I know nothing about MTX. But I do know something about other Apeks models, the internal of both 1st and 2nd stages is more or less the same. The ARCAP on FSR is useful if you have damaged the crown(corrosion or during servicing). The difference between XTX50 and 200 is the micro adjustor on the adjusting screw but the price difference is huge.I find it interesting that there are so few recommendations for SP and Apeks "flagship" models (MTX series and SP MK25 with an A700 or S620). What is it about the suggested models that make them better or more suggested? Are the flagship models "over priced", overkill or just not as good?
So far, suggestions have been for the XTX50 or XTX200 with FSR or DST 1st stage, or the SP MK17 or MK19 with G260 2nd stage. What makes those models better than the others?
At the moment, I am interested in the Apeks MTX-RC, Aqua Lung Leg3nd Elite and (SP MK17 or MK19 because they are so suggested), although with SP I am a little confused due to their assortment of different 2nd stages. What makes the G260 the go-to reg over the A700 and S620? And what is the difference between the MK17 and MK19, other than the swivel turret?
And why no mentions of the Leg3nd? Not as good as Apeks and SP?
I am still using Apeks DS4 + TX50 bought around 1997/8. The crown in the DS4 is still good and the IP still lockup once the seat is set.
I also have DST, FSR but those are for tec dive together with the DS4.