Pros
Helix is an amazing, mission-driven company. Very well backed (just raised another $200M from top-tier investors) and has the full support of Illumina, the market leader in genomics. Innovative platform model that is very differentiated from anyone else - ultimately positioned well to win because of its ability to work with dozens of partners to attack different markets. Great people and culture - collaborative, no politics. Management is committed to the well-being of people and provides great benefits. 3 months of parental leave (for both new dads and moms) is amazing for a startup and shows that they walk the walk, as people actually take their full leave with strong support.
Cons
People get entitled easily in Silicon Valley, and we're not wholly immune. It is annoying when you hear people complain about little things and forget how lucky we are to have this opportunity.