The main drawback of MarketAgent is the small number of surveys. This is generally characteristic of all survey sites, so I recommend registering on several of them at once. I manage to earn about 500-800 rubles over six months, so you can gauge the income level. Surveys come very rarely; perhaps the reason is that I don't meet the respondent criteria. It's also reasonable to assume that if the surveys are foreign (for example, German), there are practically none for respondents from the CIS. The site is reliable: firstly, it has been around for many years, and secondly, the status of a German survey site indicates that it's not just a new Russian-speaking project that opened a couple of years ago. When registering, as on other sites, you need to fill out a questionnaire that includes income, marital status, family composition, education, car ownership, and so on. Overall, it's a standard set of questions, nothing unusual. However, during registration, the site somehow froze and wouldn't accept my password. I had to enter the captcha several times before I could create an account. Earnings here are in points: 100 points equal 1 euro. For a survey, you can earn between 10 to 250 points; mostly, I received 50-100 points per survey. To withdraw funds, you need to accumulate at least 800 points. Payments are made via PayPal within 3 days, but a fee of 100 points is charged for the transfer. To avoid this fee, you need to withdraw at least 1500 points, rather than the minimum 800. You can reach the minimum amount in about six months, but it depends on the circumstances. Sometimes there are no new surveys for an entire month.