Here's my experience. After using T500 for nearly 5 years (which means I liked it), I bought a T530 with no discrete graphics card. I was hoping it to be an overall improvement, but sadly, I can't say that's the case. Some points of interest to me.
* screen: the 1920x1080 LCD is pretty good, to make the viewing not
a big challegne at this high res. A plus point here.
* keybrd: the chiclet is a step backward for me. It's too springy
which makes it more tiresome to type. However, it's
probably still better than most other keyboards, so...
*touchpad: bad. The new grid-textured touch pad is just not as
sensitive/accurate as the T500 one. I find myself doing
lots of retries because it fails my intention. Awful.
* speaker: bad. I could tell the difference IMMEDIATELY. It sounds
much coarser and tinny. I would have thought they wudn't
stoop so low to save a few bucks like this, but they did.
The whole sound system seems worse, even thru headphone.
Another item that makes me miss my T500 so much.
So far it's not the worst disaster given longer battery life (especially with on-board GC only), descent screen and keyboard. But you can't escape the CHEAP speakers, skimped LEDs, pgUp/pgDwn and some other keys moved to a more inconvenient location, and many other things. The old venerable Thinkpad T series has now become one of those CHEAP! thingies. Beware.