IFI Micro itube coupled in signal chain with Bottlehead Crack redundant?

[Rhinomyte76]

Hey All, 
 
Thanks for checking out my question.  
 
My setup is as follows:
 
Desktop PC running Jriver 22
 
CHAIN:  PC USB ---->Jitterbug ---->Starlight 7 USB 3.0 cable ---> IFI Micro IUSB 3.0-----> Starlight 7 USB 2.0 cable ----> IFI Micro IDSD ----> RCAs --->Bottlehead Crack (Headphone Tube Amp w. speedball /upgraded components & tubes) --------> HD650s. 
 
I previously had the original IDAC, and I like IFI's signature and quality.  Unfortuntately, there's not a dealer near me so I would pull the trigger without sampling it based upon what feedback I can get and my satisfaction with the brand in the past. 
 
Question is as follows:
 
Would there be any worthwhile benefit of putting the IFI itube in the chain between the IDSD and the Bottlehead Crack?
 
On the website http://ifi-audio.com/portfolio-view/micro-itube/ IFI implies that it is considered to be for desktop speakers as opposed to cans, but in application I see must people put it in their chain with headphones too. 
 
Here's a link to five examples of how IFI says the Itube may be used  https://www.facebook.com/iFiAudio/photos/?tab=album&album_id=591679184201161
 
Any personal experiences or input is greatly appreciated. Thanks.