I extensively read through the 18 page post about the HD upgrades. From what I've been able to understand is that the JB series is hit or miss. The "RTL" mans nothing more than that fact that you get cables, documentation ... etc. What really matters is the LBA (???) number. If you can find the LBA number try running a search in this forum using it and see if anything turns up about it's compatability.
Good Luck. I think that I'll try this upgrade in the next month or so but I plan on trying to stick with the BB or AB (assuming I can find one).