Pros
Can work remotely, perfect if you're bored and/or wanting some extra cash, some tasks DO only take 15-20 minutes and are great for quick cash (although these are truthfully few and far between)
Cons
Rates for tasks are often comically low, especially considering that many "clients" literally ask you to do their actual jobs for them. For example, many tasks ask assistants to perform in-depth research, complete with follow-up phone calls and detailed information for 30+ items. For $2.65, such a task isn't really worthy anyone's time. Many of these requested tasks, if done well, would take hours, if not days. Additionally, the "queue" for assistants is SUPER glitchy and unorganized. Some "clients" spam the requests like crazy, and the infrastructure in place to hide tasks you are't interested in taking on doesn't work properly.