Vantaggi
There are no best reasons to work at ConversionIR or any of its offshoots (which include: NXTAnalytic and Corona Stocks) . That said, the work can be interesting and the colleagues very intelligent - including the CEO himself. You will learn something. So, if you happen to have a load of cash in a savings account and need not worry about how to pay your bills, or if you take on a job at ConversionIR in the understanding that it's like an internship, I would recommend the experience.
Svantaggi
The main reason to avoid the temptation to accept a lucrative and prestigious sounding job at ConversionIR is the same as everyone else has pointed out here. There are no guarantees that you will receive the salary that is stipulated in your contract. In fact, I never once received it in full - sometimes you get some, but you can't count on it. Some reviewers have talked of the CEO in terms of 'Scammy'. I don't think it's that bad. I think the issue is more that he is a major risk taker and overly optimistic. He hires great people in the expectation of finding financing or building revenue quickly, and predictably he fails. Most companies get the money they need to hire a team sorted out first. Essentially, if you take on a job at ConversionIR, be ready to moonlight to make sure you have some cash coming in.