i have this and find improvements worth spending but it depends what you look to achieve.
first of all when you climb up the gear ladder remember, every component in chain will matter.
i would not recommend using uBer 3.5mm on iPod or for low resolution material because improvements concern dynamics, immediacy and similar, it will not add bass or tame hot trebles IF your source does them. uBer is removing a curtain between source and amp in a way that there is no cable and signal gets stright from A to B without "c" in between them.
in my rig, which consists of RWAK, 1p2 and T1. i use only FLAC, minimum native CD quality and maximum 24/192.
all i can tell this little cable showed good improvement in adding immediacy and space between instruments. frankly speaking i even did not plan buying this cable but after audition i could not part with it, silly me.
why i love this uber wodoo? because as you probably know the best cable between two components is no cable
literally!!! best is when you plug one component into another (please no dirty jokes), for instance Audiophileo can be plugged straight into BCN/SPDIF in your DAC using the ring adapter. in my understanding Uber makes something similar, simply it makes you feel there is no cable between two components.
but.... T1 stocks good enough cable too which does perfect job. i would recommend you try this first and if you feel the need to upgrade ask for trial period from Tralucent so you can audition and decide if improvements are worth for your ear.