This is a bit older thread, but the views keeps going up, so I'll add my thoughts...
Rebuilt an old steelie last year with a (low-end) Shimano mix: 2300 FD, Sora RD, 2300 crank, HG chain and 2300 levers. I wasn't thrilled with the 2300 levers and the hated thumb shifter, but they did shift pretty well. I worked with them for a year, and decided I wanted to get to full 2-lever STI, but really didn't feel the need to add more gears. I picked up a set of new Claris levers early this month (less than $100 eBay) and have a few rides and 100+ miles on so far.
The Claris levers are night and day difference from 2300. They feel more solid. The shift levers are more angled to the outside, so easier to reach from the hoods, and the rubber boot on the hoods is easily twice as thick on the outside edge than the 2300s. It should wear much better. I can't vouch for how others say they compare to higher-up models, but am VERY pleased with the performance so far...even at the budget price point. The all-Shimano drivetrain shifts extremely smoothly...a quick tap of the large/up lever gives a 1-gear hop, a long sweep gives the 3-gear jump...very nice when coming to stop or hill. It was a short adjustment from the thumb to lever for downshift, but can see now why the full 2-lever is so much more preferred. As for the orange gear indicators that kind of scream "entry"...a trimmed piece of electrical tape takes care of that
I ended my paying twice for my levers, but was totally worth it. If all you need is 8-speed, Claris looks to be a solid option.