I also have the Triumph slanted bags and have had them since day one. They have held up nicely. Here's a recent pic (with EZ Brackets):

Here's the same bags with the brackets. I had to 'work' the brackets to get them to fit the posts, hence the gnarly look on the keyhole openings (I got some of the early ones).

Note that I de-stitched the yoke (look just above the EZ Brackets) and re-riveted the lid and removed the tie point stuff (the small holes) that are used with the stock hangers
I have since backed them with 1/8" aluminum that fit almost the entire surface of the back of the bags. Sprayed them with a crinkle black paint. You have to really look to see them....
I've had this setup for over two years and have had no problems. Not big enough for some, perfect for me. When I travel, I use my Kuryakyn Full Dresser bag to hold all the other crap. This pic is not mine but it does show the bag nicely. I like how it has a hard plastic shell inside which is separated into two 'shelves' and that the back unzips for easy access to anything. Pic shows the top expanded also which I have not had to use...
