I read that sonic state review also, he claims he was using a 128MB cf card/adapter. He didn't say whether or not the MS-1 recognised the whole 128MB though. Still, when you look at the prices of cf cards + adapters, compared to the proper Sandisk flash cards for the MS-1, the price per MB is way better for the cf + adapter, even if it doesn't recognise the whole card.
I'd only recommend you get an MS-1 if it's a really good price. Better to get a Boss SP404, they're WAY better in sample rate, polyphony, effects, memory size etc. Don't get me wrong I love my MS-1 but you are always working around its limitations, especially that of when you tune a sample, it affects ALL of the samples, not just the one you want.