OK, so maybe I am a bit biased as the theme author but I think the theme is great! I even use it myself ... on three different sites, so far.
The theme handles all of the core "Post-Formats" with a variety of methods including specific styling, typography and indicative texts.
Although a "minimalist" theme by default, suiting my personal preferences it is quite easily extended via the many appropriately placed HTML classes as well as numerous "hooks" to add additional structures and theme functionality as required.
Opus Primus also includes "Stanzas". These are theme specific extensions providing additional functionality ... and are great examples of the themes extensibility.
Also to note, Opus Primus will display a single column, two column, or three column layout. This functionality is dependent on which widget areas are being used and is fully explained within the Widget pages of the Administration Panels.