Hmmm, I'm beginning to see why people love Roon. Until I started playing with this last week, I would have said that I was quite meticulous about tagging all my music. And based on my use in LMS and various other tools such as MediaMonkey & Foobar, I had no reason to think otherwise.
But having used Roon now for a week has made me quickly aware of a non-trivial percentage of my digital music that is insufficiently, poorly or plain old incorrectly tagged. Roon gives you an easy way to see which of your albums it identified and which ones it couldn't. After initial scan, it couldn't identify about 8% of my 2500+ albums. A bit of that made sense, but a lot didn't. At first I thought it was a Roon scanning problem but I was wrong - just me having been a bit sloppy over the years, particularly in the early years of my ripping & tagging efforts. I've since cleaned up tags on about 50 albums and Roon then quickly identified them.
Of course, the biggest win by far is in Roon's depth of metadata and UI approach to integration. It really does seem to live up to all the hype. If you're wanting to be able to see how all your music is interconnected and want to see far more depth about the album, artist, performers and/or composers, Roon is it. Sure, you can find all that information online from various sources (allmusic.com, discogs.com, etc...), but having it all at your fingertips driven by what you're listening to is way cool and so easy to use.
The down side... the Squeezebox environment has spoiled me. Very inexpensive tools such as iPeng and Squeezepad are great. While there are Roon apps for more recent iPads (and android tablets I believe), there are no remote control apps for my iPhone or older iPad 2. And a big issue for me... Roon does not (yet) stream internet radio which I absolutely must have.
So, LMS won't be going away for me quite yet, but Roon is definitely tugging at my heart strings. Realistically (or perhaps just my way of rationalizing the cost of Roon), I've spent far more $$ over the years on numerous cables, tweaks and things, many of which are sitting in a box in my closet. So my take, albeit after just a week of tinkering... Roon makes a big difference to my musical enjoyment. The UI is easy to use (non-hacker spouses will love you for it) and really does pull you into the music listening experience. It is also an amazing tool to help you find the weaknesses in your tagging efforts.
For me, it isn't yet the only game in town, but it's definitely a great one. I'm still discovering a lot of cool features. And hopefully, they'll soon release support of squeezebox end-nodes. And yes, there's much talk of how they'll support internet radio streaming.
Stay tuned!