I have bought BlueTootk Dongel for aprox. 6 €, with IVT(Blue Soleil SW), and have lot of problems using software, can't change Desktop only aproved for one desktop. 
Prices on dogel on this sites seems to be fare out, comparede to other similar Bluetooth units, or orther product, were you also get driver and software whit out to have to pay extra, so you can use product, whitout extra cost.
 It would be appropriate to aware of extra cost to get product to work on packing, so the complete cost was knowvn.
Have other bluetooth product, and don't have same kind of trouble. So I think twice before choose producer.