I purposely stayed away from carbon last time I purchased poles. Had too many friends that, wacking through rocks on some nasty x-country trek high in the mountains, the carbon poles get beat so bad that frayed carbon is showing. The best aluminum for this purpose (DAC/Helinox) still get beat up a bit, but it just seems to hold up a bit better. But, as with most things...whatever works for you.
The GL145 is a long, long stick fully extended, something I was looking for in some of my 45 degree down angle, nasty x-country treks with 95+ pound packs. Sometimes, with that kind of weight in really tricky steep downhill conditions, it is incredibly important to be able to extend that pole a long, long ways to be able to plant it on something secure and help you get down/over and obstacle that would be very unsafe otherwise. In that kind of situation, one can only imagine, with that kind of weight on that kind of slope, what would happen if pole sections collapsed at that point in time. The Groove Lock has not failed me yet and they are a very sleek, strong pole that doesn't get caught on stuff as you go by. One particular hunt I do every year I can't imagine doing without very good trekking poles.