Pros
The founder is really good with words and has the capability to manipulate you into joining the company by making you think that the opportunity aligns with your interests and career / financial goals. If you are interested in learning the art of smoke and mirrors, you should join and pay close attention to his behavior (spoken word versus action).
Cons
The truth, for most of us, has ended up being quite different from what we discussed. Low-to-non-existent opportunities to grow career and compensation, get thrown into client situations without adequate training [also bad for the clients who get subpar work and then fire Calculate], company is doing poorly financially, company is a revolving door with true average tenure of maybe 12-14 months, founder and leadership team desparately seeking a way to exit the business but are coming up against the harsh reality that the business may not be as attractive as they thought it was