Valentine (Equality Cages 125): An Intimidating Sudoku that Ends Up Being Highly Approachable

Today's Puzzle:

Happy valentine to you all, and happy birthday to me! Thank you gUBBLOR for the early access and wonderful puzzle! You'll have to excuse the slightly harder puzzle for a mid-week, but how else can you celebrate such a day but for one dedicated to it? 😁

Link to Play Along:

Valentine by gUBBLOR http://tinyurl.com/SudokuSleuthEqualityCages125

Rules:

Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.

Equality cages: Cages must have an equal number of low (1,2,3,4) and high (6,7,8,9) digits AND an equal number of even (2,4,6,8) and odd (1,3,7,9) digits. Equality cages can never contain 5. Digits may not repeat in a cage.

Shifter lines: Adjacent digits within the same box on a shifter line share both parity (even/odd) AND polarity (low/high). Whenever the line enters a new box either the parity OR the polarity shifts, never both. Shifter lines can never have 5 on it. Digits may repeat on lines.

Kropki dots: A black dot between cells indicates cell values with a 2:1 ratio. Not all dots are shown.

X: Adjacent cells connected with an X must sum to 10. Not all X's are shown.