Rising Tide: Is this Finally the Rotationally Symmetrical Sudoku I've Been Going on About?

Today's Puzzle:

Another puzzle from James' Sinclair's Artisinal Sudoku series. Another highly approachable puzzle with suitable logic to show off different techniques!

Link to Play Along:

Rising Tide by James Sinclair http://tinyurl.com/SudokuSleuthRisingTide

Rules:

Normal sudoku rules apply.

Cages show their sums, and digits cannot repeat within a cage.

On thermometers, digits increase from the bulb.