Can I use my sentry pass in the TSA Line to fly from San Diego to Dallas

Just another tax that allows the elite to pass on through. No thanks. I will continue to resist the the TSA tyranny and I will continue to opt out. If enough people took this approach, reasonable changes might be achieved.

Mexico just started its version of Global entry system. I pays to apply if you frequently travel to Mexico

It's all about time. The first time I returned from overseas and entered the customs area at JFK… and walked past 600 people in line to use the Global Entry Kiosk… it was worth every penny!

Traveled United recently and both wife and I had pre approved check for TSA but on return I had it and she did not therefore splitting us up. Mixing up carry on luggage, passports and had to wait any way for her to check thru and 10 minutes so that sucks!

Thanks to Steve for the money-saving suggestion above -- about signing up for Nexus. However, as I look at the instructions it looks like you need to show up in person for an interview, and there is a relatively short list of places where you can do that -- all relatively close to the US/Canada border. So if you're from the US (like me) and live in Seattle or Detroit or Niagra Falls, you're in pretty good shape. Otherwise, it looks like you should use the GOES approach. Please correct me if this is mistaken!

I don't think it has any advantage. Currently they only provide little bowls for items needing XRay attention and more often then not you need to put large items through; coats, hats, shoes (good shoes are held together with nails and that is a no no) except sneakers, etc.
You do not need to take off a belt unless it has a large buckle but do need to put metal items in those teeny bowls and I have had those get hung up inside the XRay machine.

So I deliberately go through the regular line most times.

lol
clearly Jack disses the system because he doesn't want anyone else to join and slow him down. We see right thru u JACk(ass)

Using Pre for work travel and it's definitely helped me get through screening faster. However, it's inconsistently applied - some airports allow Pre to go through with liquids and computer in bag, others don't. Also, there are many airports that don't offer it at all, so it's a marginal benefit overall, for my travel.

I concur with the commenters who recommend the Global Sentry program - it is totally worth it. However, it does not cost $100. Through the GOES website, you can elect to join NEXUS, the Canadian program. NEXUS costs $50 and automatically qualifies you for Global Sentry - go figure. Therefore, you can get the benefit of Canada and U.S. Trusted Traveller programs for $50 and enjoy the full, "right-this-way-sir", treatment. Lastly, for an additional $20 or $25, you can also opt for Sentri, which allows the same ingress/egress privileges for Mexico. I believe the the Netherlands and S.Korea are also implementing programs. As more countries join the Trusted Traveller consortium, it makes sense to check the GOES application process very carefully before paying $100 and only applying for Global Sentry.