They are roomy, and I much prefer the magnetic closure over the velcro. Downside to me is, I think they just look a little sloppy. The T-bags looked much better installed, but you couldn't get much in them.
I had the 3 pocket T-Bag windshield bag on my Street Glide. It was okay, but the vinyl seemed kinda stiff. However it always stayed closed as long as I had the 2 pieces of velcro sealed good.
When I bought my Electra Glide Classic I decided to try the H-D 3 pocket bag with magnets. Personally I like the looks of the H-D bag better and I like the magnets better than the velcro. Easier to open, but secure when closed.
I chose the new style HD 3-pouch over the T-Bags because I think on the the HD one the side pockets are a bit larger. Centre pocket is big enough for glasses, cell phone, small camera, etc. To me the T-Bags one looked plasticy as well. But that's just me.
I had the tbag on my previous bike(08)...Looked good but couldn't carry much....I have the new Harley 3 pouch(magnet) on my new bike and love it.....Looks Great and easy to get into with a lot more usable space.
I also have the new HD bag with magnets. I like the fit and finish a bit better and the magnets are pretty strong. Never had an issue with them. Velcro always seems to wear out as it ages and from use. Also, the HD bags allow you to remove the left side bag and still mount your GPS up high.
I have the 2 pockets HD w/ velcro, too small for wrap around sunglasses. Might switch to magnetic ones. Seems like after several years, the "vel" don't "cro" well anymore.