I use it for 3 years.
This amp is strong and resistant to dust (lol), the only downside is that it has no fan so heat is lost quite a bit of his power (after use of more than three hours, I corrected by adding a small fan).
The value for money is excellent.
Yes I do it again with the experience that choice with eyes closed, I recommend it to anyone who wants a robust amps (use mode Brig).
PS: I g the r300 is the same as the r300 + only the facade of the amp to change.