They are perfect for those amongst us like me who suffer from rheuamatoid arthritis in the wrists/hands/fingers...mine sits in the Robbe tray, and with the extended sticks, I find it so comfortable to use. I had an F-14 previously, fully modded up, and that was perfect for my DSRV.
I do have the helical aerial for mine, but I'm wary of using that in a sub, I had one or two problems with the F-14 with the short aerial whilst submerged, so I tend to stick to the longer metal one.
I bought mine with the Robbe multi function module, eight channel rx, a high capacity battery pack, one set of extra switches and both sliders all fitted from DM on here, as near brand new as you could wish for...half the boxes and packets hadn't even been unpacked, for the sum of £300 (
http://www.modelboatmayhem.co.uk/forum/index.php/topic,47436.0.html ) I added the second switch module, a tray and the extended sticks...now it's as near perfect for my needs as I'll ever get.Rich