Unfortunately, you don't get a lot of really good sounds out of 64MB - that's about how much you need just for a good piano. To use a sampler effectively (think sliced drum loops or a really decent sax or a hiphop drum kit) you are going to need to reload the memory pretty often - the factory ROM is pretty good in comparison to most REALLY memory-efficient sample sets (and most modern sample sets try more for realism than memory efficiency).

The T2's 512MB is what I'd call adequate if you couldn't reload too fast, but it still takes more than 30 minutes to load...... not very practical on tight gigs!

No...... what we REALLY need is 512MB or more of RAM..... PLUS genuine USB 2 load times. Then sampler use on arrangers will really take off.....