I've got a couple of the 1650's that have been all over the world, though not so much in the past couple of years. They're tough, secure and easy to spot coming off the carousel - and they have their own built-in wheels so I save a few bucks by not having to rent those carts.
Packing them is a matter of go slowly and stuff gently. If you can't fit your gear into one of these monsters, you might reconsider your packing list. I know I do on most every trip...
The notion that they scream "steal me" seems anecdotal, at best. I know a number of folks that have them and I don't know anyone that has had theirs stolen. I've got a few hundred segments on mine and haven't had a problem yet. Lots of folks have had their suitcases broken into and in this day when TSA opens pretty much everything, it doesn't seem to much matter. I secure mine with some custom printed cable ties used to seal cargo boxes, perfect for letting me know if anyone has opened the box. Back when I was listening to all the anti-Pelican hysteria that seems to permeate the various dive boards, I did stencil my boxes with "Life Support Equipment" and a large red cross and a fake company name with my home address and phone number - and no dive flags or Cozumel stickers. I don't know if it deters thieves or not, but it gets some interesting looks when checking them in.
As to the weight issue, they can be a pain in the back as well as the keister, but thus far I've only rarely had to pay extra to haul them. Approach the counter with a friendly smile and a confident attitude and you'll find that
lots of things go more smoothly. Inasmuch as I rarely sit in the back of the plane, especially on long flights, I might be the recipient of some special treatment, however. Cripes, I hope so for the extra fare...