It isn't just about reliability. There are three versions of the MFW-15's amp. The first two are very powerful, but either run hot or are prone to failure when the unit is switched on. The third version is significantly less powerful and lacks certain features of the original. Craigsub, who tested the first MFW-15 back in 2008, does not apply his rating to the current MFW-15. It is an unknown quantity.