The device works just fine as described in the ad. As others users have reported though, it's unfortunately not possible to have it permanently power up in 'merge' mode (it powers up in split mode regardless). Sometimes I forget to switch to merge mode on power up and I freak out for a bit wondering why my setup is not working as expected...it's a bit annoying not to be able to select that. It would avoid some head scratching and especially save time.