I had Dunlop SP2030s in 186/55r16 on my 2010 Insight ES. All four developed cracking between the treads, which turned into a slow leak in one of them.
I asked about warranty on them but at around 25,000 miles was told it was too late by a Honda dealer who sold me some pre-puncture sealant (superseal or something like that). The sealant stopped the leak. I also phoned Dunlop, who told me that they would cover the tyres on a cosmetic warranty with a percentage of the tyre value allocated on a treadwear remaining basis. They assured me that they were safe and the cracking would not lead to catastrophic failure (well - they would say that unless willing to recall them I guess). I didn't claim because the sealant seemed to have solved the main problem for me and they'd already lost enough tread to make claiming not worth the hassle.
I eventually changed the tyres at just short of 40,000 miles a few months ago (approx 2.5-3mm tread left generally but there was a bit more inside wear). Swapped them for Toyo Proxes CF2 (again 185/55r16). They've seemed pretty good so far but the tread pattern suggests it might not be the best in snow. Thankfully they've not seen much of the white stuff this winter.
Interestingly, I went for pre-puncture sealant from the same dealer as above in the Toyos but it caused me wheel balance issues, manifested in some fairly prominent vibrations at speed. Don't know if they used a different product but I only put up with it for a few weeks before having it cleaned out and the wheels rebalanced.
Regarding the inside wear on the Dunlops - I suspect the problem isn't the tyres but is more likely to be to do with the proliferation of speed humps we have in Sheffield. Going over those repeately at 15-30mph is going to scrub the inside edges a fair bit.
Edit: I see this thread includes mentions for different tyres in the standard size. Here are a few newish options I spotted in 185/55r16 that have been launced in the last year or two with euro ratings:
Toyo Proxes CF2 C, B, 70db (what I've got)
Pirelli Cinturado P1 Verde C, B, 69db
Michelin Energy Saver Plus C, A, 68db
Bridgestone Ecopial EP150, B, B, 70db
Yokahama BluEarth AE01, C, C, 70db