I use it for 2 years and also know the old model that is used for some time and these amps are very tough, they have no ventilation and radiator heats a lot when used at full power, it loses a little momentum but will.
Its price has dropped and has a good value for money. If you are likely to need more power to you facing a R500.
This opinion focuses on the R300, but the R300Plus has the same features, only the facade has changed.