In the picture above, a North Trustbar 2012 (bought may 2013) which has been used for something like 30 to 40 kite sessions. Beside the fact North is well known (as a german company) to make "bomb proof" kites, I cannot say the same for the trustbar (I got several different models, 2010, 2011 and 2012), especially in terms of durability (which by the way should be considered as an investment, security and moneywise).
First, the very well known problem with the depower line, which wear too fast and its a pain in the ass when you need to change it. Looking around on the Net, it seems that one way to solve it is to put some wax on the rope to limit its consumption. Anyway, this should be a problem that North customer shouldn't solve on their own.
Second, it seems that the Trustbar could potentially has some security issue with the fifth line as the redline could get stucked in the vario cleat. I experienced just once in the hundreth of session I had in the last three years, but still this could be lead to dangerous situation since 100% depower is not assured anymore in case the red line is not free to slide. North should be aware of this and improved the vario cleat design in the >2013 Trustbar model which now has a 5th line channel allowing the red line to pass into it. Still, <2012 as="" aware="" be="" compromise="" div="" issue="" it="" might="" of="" security.="" should="" this="" users="">
Moreover, the velcro strap isn't really reliable, and the depower line often get tangled over the front lines. Still, 2013 model should have improved the stiffness of the depower line inserting a red plastic line.
Third point, and this is a quality issue, is related to the EVA grip of the bar, which often peels off the bar itself. Mine started peeling off just after a few use, and now is completely unusable. It seems this is a common problem (see here) also in the 2013 bars, something that you wouldn't expect from a 400€ bar. Luckily I registered the product with North and have 6 months warranty extension. I sent an email to the reseller (Surfpirates) and they will send me a new bar (plain, of course) for free. But just in case I reordered a depower line too...
21.05.2014 Update #1
Just received a brand new 2014 plain trustbar directly from North. I will have now to substitute all lines (including the f**king depower one). I also discovered that one of the frontlines appears to be overstretched, I will probably have to change it.
30.05.2014 Update #2
Just found out that the irohead is completely oxidized. While hammering the f@@ing pin out of the pinhole (Thanks North to make things a little bit more practical) to the ironheart broke in two pieces. No way. I got a new bar, lines, a new depower but I miss the iroheart, let's see if warranty claims will sort this out.