I was thinking of getting it over the 400 and using it at both 400 and 800. I’d like a trial pack of the 100, 400 and 800Lomo 800 is my goto colour film for lower light (400/800) because it's cheap (for fast colour); the colours balance more nicely (i.e. less pp needed for me) and the grain is very fine for 800. The images I've taken have suffered when under-exposed, but when the exposure is good, it lights up.
Would heartily recommend over Portra 800 by a mile, and as they do bulk 3 packs in 120, I'd choose it as a 400 "circumstance" film for 120 too.