Yeah, I don't like buying 32GB or 64GB iOS devices. You really don't need that much space for apps and their data, not even for photos and video unless you take and keep an insane number of images. Maybe if you play a ton of high-end iOS games at the same time, but I don't. I do play a lot of games, but I'm a mainstream console and handheld gamer. My wife is the big iOS gamer, and she plays puzzlers and doesn't need much space for those on her devices.
For me the extra storage would be all for music and it's a pretty substantial premium just for extra storage, especially if I replace device every 2 - 3 years. I'll keep Spotify Premium no matter what. I like the total access subscription model just as much as the buy-to-keep model, and it's cheap at US$10 per month. I still buy-to-keep from iTunes what I especially like from a new Spotify discovery. And of course I want ready access to both Spotify and my whole iTunes library, on a 16GB iOS device.
My concerns for Match are streaming quality versus playing from local files. I'm not what you'd properly call an audiophile. Yeah, sure, vinyl has a richer sound, right, I get that, but I'm never going to give up the convenience of digital and compressed to exclusively play records on a Sota turntable the price of a car, or rip every CD I own to Apple Lossless. Still I can tell the difference between a pair of Sennheiser Momentums and various fashion statement headphones, especially the US$100-range headphones, and I have a good quality portable analog headphone amp. Sure Momentums are a fashion statement as much as Monster/Beats or Skullcandy, but they're a fashion statement with what I consider better attention to balanced audio quality. I just want to get the best I can out of my playback and listening equipment. Doesn't have to be perfect. I'm not going to run out and buy a US$2,000 DAC. I just don't want muddy and bassy from headphones that should subtle and clear in the mid- and high-ranges.
But, as we've mentioned, if iTunes Match streaming matches, pardon the pun, the streaming quality of iTunes Radio, I don't have anything to worry about.
All that said, I suppose if all I had to listen on was a 20-year-old jambox with noisy mix tapes, I'd listen to those and be happy. It's when you start comparing pricier equipment you get silly picky.