UberX and UberXL are the cheapest services where driver's use their own cars. Can seat 4 or 6 people respectively. UberBlack and UberSUV are premium services with licensed drivers and cars. Can seat 4 or 6 people respectively. UberTaxi is a service that requests a taxi via the app.
During busy hours, Uber raises prices drastically. On holidays, it isn't uncommon for 10 minute rides to cost around $150 USD. An increase of up to 800%. Also, Uber doesn't pro-actively notify users of surge pricing.
Uber often takes part in ethically questionable business practices such as purposefully sabotaging competitors by ordering and canceling rides in bulk, pushing questionable auto loans to drivers, selectively spying on customers and ignoring regulations.