i did have some Shirley Wellards a while ago. they actually do work very well, but my only problem was that in the dark, with 30-40 IXMOO's I always managed to mix them up!
The best case for loading your own is Sebastian Salgado - when he did the SAHEL book, he travelled around Ethiopia with a couple of M's and Tri-X in bulk rolls. He did have limited amount of cassettes (I dont know if they were IXMOOS) and as he used up film, he would unload the cassettes and stick the 5ft 5" long strips abck in the filmcan and load up fresh film!
A friend of mine did the same thing on a trip to Russia in the early 90's. He spent 6 month criss crossing that huge country. Limited amount of cassettes and when he returned he handed me 5-6 100ft cans and asked if I could process them for him. I did think that he had put 16-18 rolls in each can, but he had managed to stick 25-30 in each!
There was also the problem that he had mixed up a couple of cans and had both Tri X and Russian Type 17 (an aerial surveillance film that he picked up for $2/100ft while there). I did settle on Beutler as a standard, Tri X gets a bit grainy in this, but it suited the subject and the Type 17 was OK. However, I think the Cold War was a sham - you could not distinquish between an outhouse and a T-34 with that film!
For commercial work, I dont think I would bother with "home rolled", but as i tend to use a lot of film privately (between 600-800 rolls/year) a saving of $2-3/roll adds up!