Naboo, I'm pretty certain the Nissin ones will be reliable and cheaper than the Nikon ones. Think WEX sells them for about £45 - don't know what the Nikon cost is.....
Hmm, 45 quid is getting a bit close to the 65-70 quid for a Nikon one, so I think that I'd probably pay the extra if it came to it. Thanks for the tip though, SM, I'll certainly keep it in mind

.
I've been using an SC28 cable for around ten years now makes sense to buy the Nikon one, I'll no doubt need to buy a new one at some stage but the original is still going strong
TTL and flash full zoom capabilites unless you start bouncing in which case it sticks to the widest setting.
I agree, I
do generally like to buy 'the best', but I thought that a cable was just a cable, regardless of who made it :shrug:. Clearly, that was pretty naive of me

.
SC-29 all the way - the oncamera bit does indeed help with focussing in near dark too
Once you have one, you'll probably end up using it more often then you currently imagine, especially as a way into 'strobist' use
The SC-29 fits atop a monopod and stretches out to about 6ft, and I use it that way often at Weddings for the OCF look with the convenience of iTTL too. But I also mount it to tripods sometimes and work 'free' within that 6ft range
Great for macro/flowers/people up close too
DD
Thanks Dave! The SC-29 seems harder to find than the SC-28, but I believe that it's only fractionally more expensive. So, if I find myself in real need of a cable, this is probably the one that I'll go for.
To be honest, since I got my second SB-900, I haven't found as many opportunities to use it as I thought I would :|. As I'm not a pro and don't work with models or clients, I only really get to practice with friends at social events. The problem there is that we tend to be in confined, public places, where I can't set up lighting stands everywhere and haven't (yet) mastered getting the optical triggering to work. Instead, I've resorted to using just one SB-900 ...
on the hot shoe 
(although it did have a Lumiquest Ultrasoft on, which helped smooth things out a bit

).
The idea behind buying the cable was that it would allow me to go 'off-camera' with total reliability, so that I could hold the flash myself (or get a friend to do it) and not worry about whether or not the optical triggering will work. In one 'portrait session', which I tried to do recently with a friend's family, I needed the SB-900 to go way behind me, but wanted to get in close with the camera to take some close-up shots of their toddler. The D700's built-in flash just wouldn't communicate with the SB-900, as the signal was only bouncing off a dark brown sofa :shake:. I thought that a cable would have allowed me to use one SB-900 to add some low level, diffused fill lighting, whilst also pointing to the second SB-900, which was far away, but zoomed in with an orange gel filter on, to create a kind of 'sun ray' effect on the sofa. In the end, I just moved one flash closer to the side of me and took up a shooting position further away from the subject. Results were OK, but nothing like as 'creative' as I had hoped.
So, those are the kind of things that I've been trying to do. Maybe the cable is the right tool for the job, or maybe I should consider radio triggers (which would actually be cheaper, if I went off-brand again

).
Must give it some more thought

....