Hi!,
Good question! No. It´s not difficult at all. It´s like any design with gradients you see. The only limitation for logos with gradients is Silkscreen and embroidery, you need plain colors for any of those methods.
I don´t see any problem for the gradient versions. They are easy to reproduce using Sublimation or Laser methods, I´ve done it before and results are great.
I´ve uploaded a plain colors version in case you want to compare. You can always have a volume (gradients) version and a plain version for different needs. As you see with plain colors all volume is gone and design needs to be simplified. This is only if you want to go with silkscreen.
Here´s a link to some t-shirts I printed for a client about 3 years ago. They have gradients and it still look perfect: These were made using color sublimation.
http://i33.tinypic.com/waoyv4.jpgI´ll be around if you need me,
Thanks,
Nat