I recently ordered a used HD100 MkI to replace my HD147 Head. I already have the FBV Longboard that I purchased with the HD147 years ago.I understand that the website states that my new HD100 head and the FBV Longboard are not compatible, but I'm curious as to what extent? I'm really not in a position to purchase an updated FBV at this moment and I'm just wondering which features are not compatible between the two or if the whole unit will not work... I've seen similar threads, but none outlining my specific concern. Thanks in advance for any helpful info!