I've had the small zipped bayswater for a few months now. It's a really nice bag, overall. It's very stiff or structured so it's hard to fit in many things (compared to other, softer leathers, then it's almost a metal plate). I tried to look the other day when it went through the security scan at the airport, and it seems the wiring is similar to a normal bayswater or Alexa, whereas the leather itself is thick and is made to hold its shape (unlike bayswater whose wiring can easily bend under the weight of the bag so that it looses its structure - hope you get what I mean).
Because the leather is thick and designed to not "collapse" then there is room for limited items if you want to close it. It's quite small, even too small for my work computer, so when I use the bag for work then I don't close it. It unfortunately means that I rarely use it for work. I measured it prior to buying and concluded that it'd fit, but I measured at the top.....and there are a few centimetres difference from the top to the bottom. Anyways, keep in mind that the more structured bags like the zipped bayswater can hold limited items compared to bags with less structure. The small zipped bayswater doesn't hold much so if it's right for you depends on what you need to fit in. The strap is attached on each side of the zipper meaning that when you wear it crossbody then it's pulled in towards you.
It's a very nice bag, I really like it and enjoy carrying it with me. It has a nice fit crossbody. But if I need to bring my laptop for work, or if I need to bring a lot of stuff then I would use my Alexa in most cases. I can take a picture of what it can hold before I can almost not close it to give you an idea.
Nb! I've assumed that you've had the small zipped bayswater in mind as it's the only one that comes with a strap (even if the website states otherwise).