Hi BearSummer,
Thanks for the effort! Look forward to hearing your answer.
This is the quote and review from another site (photographyreview. com).
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"Reviewed by: Brian Chang, Intermediate, from China
Summary: If you have a Canon line-up and shoot architecture, there's nothing else to choose. The TC1.4X worths considering. With the TS24 and the TC, you virtually have two lenses of correct perspective (24 and 35, lovely focal lengths) for less than $1,500.
Strengths: Tilt and shift capability; Fairly good distortion control; Good optical quality considering its huge image circle; Auto-aperture (The only auto-aperture shift lens in the market); Works with TC1.4X (Though not officialy by Canon)
Weaknesses: Bulky; Pricy; No auto-focus when not shifted/tilted"