Absolutely 5 Stars app - ID does some unique things that help image quality that you will not find elsewhere.
- sharpening - this has multiple state of the art sharpening algorithms at your disposal that rival or exceed other leading raw converters (C1, DXO, LR, ...)
- noise reduction - works really well
- monochrome conversion - one of the few apps (besides AccuRaw Monochrome) that applies a different de-bayering algorithm specifically for monochrome (again with 2 choices of preference, including smooth tonality)
What it doesn't do (yet): Missing the powerful color wheels of C1 (to be fair, no other app does those). Missing convenience features from LR (e.g. automatic perspective correction). Missing local adjustments (= if you're using ID, you still need an image editor, e.g. Photoshop, to finalize processing all of your images to your satisfaction. With LR, arguably you could try and get by just with the raw converter).
ID doesn't try and do DAM (asset management) and I would score that as a positive. The half assed capabilities in some other tools only slow down my workflow. ID is focused and fast, I hope it stays that way.