Mflb imo. Nothing better than a brand new box, some 2700's fresh off the charger and the wpa to cool the vapor down. The milk will be delivered. Most of my friends say that its too hot hitting natively, and i tend to agree. With a stem, its not going to burn your lips/mouth but your throat may get irritated. My mflb is a backup home unit for my wdz, portable vaporizer, stealth vaporizer (native), semi portable glass water cooled vaporizer, and uncorded bong capabilities with good batteries. Along with the option for an upgrade to the PA, witch is awesome.
The warranty, performance, quality, accessories, price, portability, and novelty make the mflb my vaporizer of choice.
Was the box you used a newer box, or one heavily discolored / possibly taste compromised to a degree? IE, do the hits all taste similar in a way, even across strains? Due to oil accumulation below the screen on the wood. Were you getting nice hits with the box, could the batteries have possibly been shitty?
Give it another try, you wont be disappointed imo.