i have 9 modules including two modules used for clean tones - the 'blackface' and the 'clean'. the 'clean' was the first of the two i bought and i loved it from the day i got it. i then purchased the 'blackface' on ebay cause i figured it would sound better than the 'clean', but to my ears, the 'clean' module is just so warm, round and rich sounding. i prefer it over the 'blackface' which is more brighter sounding and not as warm or round (and which i barely use). when i pair it with my ernie ball/music man luke guitar that has emg pickups and i put it in the fourth position (neck/middle), i can get the exact tone of 'nothing else matters' off of metallica's 'black album' (just to give you a frame of reference).
i'm really glad i bought the 'clean' that was included with a loaded rm4 i bought because i think if i didn't, i would have gone straight for the 'blackface' and wouldn't even bothered checking out the 'clean' because like i said, i would have assumed the 'blackface' would be the 'be all/end all' of clean tones. i would highly recommend the 'clean' tone if you're trying to go for a jc-120 clean sound. it'll get you closer there than the 'blackface'.