What features should I expect to find on a cement mixer?

• It should have robust construction with perhaps a steel frame supporting the drum.
• It should have a powerful motor to drive the mixing blades
• It should have an easy mechanism (probably a tipping mechanism) to enable you to get the concrete or cement out when it is mixed.
• It should have a decent capacity, perhaps 130 litres at least, to reduce the amount of times you have to mix for one job.
• It should be easy to transport, so decent, smooth running wheels are very important.