Pros
Welcome is excellent at hiring genuinely good people. This is by far the most positive, supportive, collaborative and kindhearted group of people I've ever worked with. When you build a values-driven company, the day to day stresses of building a business become so much more manageable. Challenges or problems are talked through and resolved rather than being dismissed or turned to high school gossip. Leadership is transparent and actively encourages two way feedback. And it's all based around the best product team I've ever worked with. I often tell people "Welcome is the first company I've worked at where I've never felt like I wanted to quit."
Cons
This isn't exactly the world's easiest market to crack as a business. There is huge potential, but there is also risk. Like any business, a lot of things are outside of your control. You've gotta be comfortable with frequent rapid change, trying and failing and learning from failure, and gritting it out when it gets tough.