In reply to superman12:
Okay, thanks for clarifying the background to your OP. Sorry if I came over as a bit judgmental in my post btw!
Picking up your points, I think the sizing issue is just human error on your/friend's behalf. I imagine the jacket was the size Alpkit said it would be on their site. I didn't check the dimensions when I got mine but had tried on a friend's 'small' which was just slightly tight on me, so went for the 'medium' and the fit was spot on.
I wouldn't expect a huge amount of down to leak at the seams, just the very occasional feather, but it does happen, even from new. If it's leaking a lot, then it is an issue that needs to be resolved. I'm sure, like every other manufacturer, rogue garments get through the quality control procedure on the odd occasion.
Straggly bits of thread seem par for the course these days, no matter what clothing/gear you buy. It's not ideal, but it does happen a lot. I had to snip a 3-4cm piece of loose thread from the base of my zip stitching (on the new Filo.) So far, there have been no other issues with the stitching.
Onto the issues I had with mine: the loft hasn't really changed as far as I can see, however, I think the design has probably just been tweaked since the Mk. 1 versions. The fill seems tighter packed in the fore-arms now, or the outer shell 'pockets' are smaller. Either way, I have no complaint regarding the heat loss there and in fact find the new jacket warmer than my Mk. 1. It is however visually less 'bulky' in this area.
The toggles for the hood cord adjustment is still my one bone of contention. IMO, it's a poor design and one that I still have issues with. So far, on the few occasions I've had the hood up and closed at the chin-strap, I've only used the upper of the two snap fasteners and the cord hasn't been pulled really tight. I'm not sure how I'd try and arrange things if I really had to 'batten down the hatches'.
The non-velcro closure cuffs is a minor quibble too. I think the theory might be that, if you're wearing such a warm jacket, you're more than likely going to be wearing warm gloves too.
One final point I'd note is that the two-way zip, on mine at least, is very snag-prone and is guaranteed to take 3-4 times before I can fully open or close it. Unlike some zips where the upper 'fastener' sits over the top of the lower one when they're both in the down position (like a male-female connection almost) both fasteners are the same size on the Filo. I find this a minor pain, but a pain nonetheless. The Mk. 1 didn't have a two-way zip, so this is at least a slight improvement when belaying.
Having said all this, I still think they're excellent jackets, particularly at this price point. Hopefully you'll manage to get something sorted with Alpkit - their customer service is excellent. Best of luck.