The main beef [with the Apple version, I'm guessing it's the same with Android] is that, although there's a nice folder for m-tickets, the list of tickets booked online to be collected at a machine has disappeared.
This was a massively useful feature as it made it really easy to locate that pesky reference code while fiddling with your credit card at the ticket machine; Now you have to rummage around in your emails for the right one and then expand the screen to be able to read the number. From the comments this sounds like one of the main things users really liked about the app. This feature worked at account level and the app kept you logged in so, regardless of which device you used to book a ticket, the reference was always there at the tap of a button.
I'm hoping that the pile of negative comments is causing GWR^▸ (Great Western Railway) app developers to scramble to restore this feature; Meanwhile, I for one am checking other train company apps to see if they have this feature. [The trainline app does it very well but of course if you book via them you end up paying entirely unnecessary booking and credit card fees.]

That's disappointing- I only have to lug my bike up & down stairs @ TLH but I see many families with pushchairs struggling with them. In this day & age I would have hoped that any opportunity to improve such faciilities should be grasped. Within the overall cost of the Reading area improvements I would have thought the cost of lifts @ Tilehurst wouldn't have registered!