differences in temp?
i think it is resonable to assume that anytime something is mass produced overseas and sold cheaply here in the states, that there is a strong likely hood of varience in preformance, from unit to unit, and that some units are bound to preform better than others, whether mr 148 or rp. so far i have yet to see any evidence that rp preforms better than mr 148 (and i dont think i will). like earlier posters have said , there are other things likely to affect performance as well, like room temp, amount and type of contents (water, media, container size, etc) so unless one person had at least a couple of both units and tested them all under identical circumstances, we may never know. i have heard that both units tend to get warmer at the top than the bottom, which makes sense if there is little air movement inside the unit. i dont know if thats the case, but if it is, it seems like the accuracy of temp control might be improved by mounting a tiny 1-1/4" computer fan inside. just a thought.