I have a Val6 EPX, and a MITM 125k.  The MITM was less than half the price of the Val6.  The MITM uses a little more fuel while putting out a little less heat (the Val6 is a 144k).  The MITM does not have a thermostat.   Them Val6 can be switched from hi to low while running, while the MITM can not really be switched from hi to low without shutting it off and restarting. The MITM will smoke a little more when first lighting but I have not been able to tell a difference in fumes once they are running.  I have been running #2 diesel in them. The MITM is a little louder but nothing like a torpedo style heater. As far as dependability I have had them both right at a year and no problems yet.  I have had to clean the fuel filter on both once or twice. Hope I answered some of your questions, if you have any more just ask.