I am comparing the Apexs XTX50 sidemount kit to the Hollis DC1 212 sidemount kit for tec diving with trimix. From all of the reviews I have seen almost all of them say they are both amazing. The one noticeable difference is the price Apex is $1500 and Hollis is $1050 so a significant savings. Any body out there dived both in deep water and can speak for both pros and cons?