Satisfaction seems to vary greatly, and I think it has less to do with the Echo itself, and more to do with the overall use of the Echo, and the content coming from the cable company.
You'll hear lots of "I only use it for Live/Recorded TV and I love it!" because the Echo seems to generally stink at playing back ripped Blurays of any quality at all.
Of the folks that seem to think it's great for live TV i think that is a combination of people that cant see/can't recognize deinterlacing problems, and people who don't watch interlaced content.
When you consider the wide range of content that is coming from cable providers (480p, 720p 1080i, MPEG-2, h.264, encrypted, unencrypted, copy freely, copy once, copy never) your going to see different results from one provider to the next. Throw in people's different tolerance for various things, (and their ability to perceive it in the first place)
In other words, satisfaction is in the eye of the beholder.
RAID protection is only for failed drives. That's it. It's no replacement for a proper backup.