The Shiva's are quite impressive all arround- both on the SQ and SPL side of the works. Dan Wiggins and his team designed efficient and capable driver.
Presuming that this is the one you are referring to......//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
I honestly have not heard this one for myself yet. I stress the "yet"- //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Thus far, from what Dan Wiggins has posted about it on a few other forums, it sounds as if it is just as impressive as its older brothers. Based on Adire's attention to design and track record thus far, I believe it is a safe assumption that it is a well designed driver. I would suggest contacting Dan about this directly or speaking to one of Adires Engineers firstly- they would likely be able to shed some more light on this for you.