Dual flush Mansfield toilet. Opinions please

The Mansfield Co. has a toilet on the market which is a dual flush toilet - lift up the flush handle and it allows a 1.6 gallon flush - press down on the flush handle and it allows a one gallon flush. Has anyone had any experience with this type of dual flush toilet? Do they work? Is it difficult to get parts for them if they need repair? If you had one already and it broke, would you get another one to replace it? Thanks for your help. Joe
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