Yes the Studio V does have hiss. It's not as bad on the Crystals though as they aren't as sensitive. Are you in the US? Maybe you could just buy a Rocoo BA and by A TF10 for cheaper on eBay or amazon? For the money I recommend you get a pair of GR07 and the Rocoo BA separately.
I live in distant southeastern country.
Buying from eBay or Amazon will charge me about 25$/kilogram for shipment fees and taxes for imported electronics
There are jaben stores here selling UE TF10 and GR07 for expensive price (TF10 brand new for 350$, the used one sold for about 180$-240$, and GR07 brand new for 160$)
Those prices... hurt my walllet