My co-founder and I also went through this program building our company, Chalet. It was a fantastic experience. Everyone at Expa is smart, talented and very interested in helping the Labs companies succeed in whatever they can; similar to how @mikeschmidt describes, it's almost like they are members of your team.
You get a lot of access to and support from the partners. During our first month in the program, at a meeting with Garrett, we actually got some of the best advice and directional support we'd ever received. Without just that meeting, our company would not be the same as it is today.
My co-founder, Michelle Cunningham, also wrote up a short blog post about our experience with the program: https://blog.withchalet.com/chalet-expa-our-take-on-labs-b32...