Downloading some DLC now. Song sizes are 25-30mb average, looks like. Will report back.
Also, I like the new strum bar. Does take some getting used to on up/down strums but as I mentioned earlier I don't get as man bullshit misses from rocking out too hard and it 'springing back' to up and registering an extra strum, breaking my combo (happens with every GH controller I've tried, at least 5-6 of them). And it's definately not 'getting worse' over time. This controller feels significantly sturdier in its construction than the PS2 or X-Plorer did.