As a boulderer, the Sirius is my go-to shoe. It offers precision and stability, whilst the flexible midsole helps the shoe perform on a range of angles. The reinforced laces give you every last drop of snug fit, and it has the same superb rubber as the rest of the range.. Unparallel describe the Sirius as the 'perfect combination between sensitivity and friction'... this medium stiffness midsole is the best thing about the shoe - it gives a flexibility rarely found in an aggressive downturned shoe, and for me the Sirius performed well on a range of angles. UKC 
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$128
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