Hi there Peterfin,
All i can say to you is,all the above are very valid comments, and do get all the facts for and against then choose which unit suits your needs.Its YOUR money to do with as you wish.
I used the SBS1 for 2 yrs then got tired of downloading 3rd party software,which as you well know is not directly from the manufacturer but their users.When i looked at the RB it was perfect for my needs,all in one box very good back up from AirNav and brilliant forum where you can be as open as you like and get the help and SUPPORT very quickly with other users and AirNav themselves,not with SBS,by this i mean the Kinetic team.Also i have noted that there was a comment that SBS is more sensitive than the RB,my own experience is quite the reverse,i will give you my personal opinion.
SBS -Distance 235nm RB-Distance 268nm peak distance 287nm
local aircraft 250 max local aircraft 410 average
This is using the same antenna and pre-amp which was designed for the SBS so as you can see FOR ME the RB suits my needs,and as i said its YOUR MONEY AND YOUR CHOICE,i feel now as i`ve wasted nearly £1K but at the time that was my choice,should have waited,but boys and their toys as they say?