I just used PB to sell my house last week- had 24 showings in the first three days, sold for a price above what I expected, and I estimate I saved $13k compared to if I worked with a realtor. It was busy, but PB really streamlines the process and I was given friendly customer service along every step of the way.
That said, the market is strong and my house was the type and location to sell itself. PB doesn't work any magic- it just streamlines the logistics. Ultimately, all the important steps along the way- how your house is staged, the wording of the description, asking price, strategy with offers, etc- are all on you as the seller. Do your homework, have a clear plan.
PB can save you money, but if your ideal is having face-to-face conversations with an invested, patient expert who can walk you through the entire process step-by-step, you might want to find a Realtor (although, to be fair, many Realtors don't fit this ideal either!)