I haven't gotten to use this on a trip yet, but I am VERY much so looking forward to putting this bad boy to good use. It clearly has great build quality, from the lining material down to the zippers and buckles. Very comfortable to wear and its straps are easy to adjust.
Two things to note: the 37L version doesn't come with a water bottle pocket, and the only compartment that benefits from expanding the backpack to max capacity is the clothing compartment. Not really a problem since it's a travel backpack, just something to keep in mind for how you approach packing. Overall, 45 dollars for a 45L backpack of this quality is an amazing deal. I can't recommend it enough.