Yes, I've used a lot of them on my Traeger, and have posted on them at some length,
here and
hereBoth of those threads are quite long, so I will summarise here.
From the point of view of fuel, they go through the auger fine and burn well.
From the point of view of flavour, I was at first unsure, as - to my palate - they didn't seem to have as much flavour as the pellets I had been using - not bad, just not as strong. However, the price was a powerful argument to persevere. Because they are half the price of anything else I've found, they became my pellet of choice when cooking on high (i.e. as pure fuel), and when smoking, I tend to start the hopper off with something a bit stronger, but after a few hours top up with these.
As the second of the above posts describes, my opinion of them improved with use. Subsequent cooks I found that although the smokiness didn't knock my socks off straight off the grill, it developed well in the fridge overnight. As I do a lot of batch cooking for reheating later, I started using this to good advantage, and I am now quite a bit happier with the Lil' Devils.
So I suggest you give them a try.
With regard to the actual service from Liverpool pellets, it is second to none.