I am a big fan.
Nights Dawn trilogy - very enjoyable, first read in book form; listened to audible as a 2nd read. The ending feels a bit rushed, but then again there was soooo much going on, so many story arcs. A top quality space opera with solid character building and a fantastic universe.
The void series...the 2 prequels (commonwealth saga) are completely awesome. MorningLightMountain is so amazingly alien yet devastatingly easy to sympathize with. The main Void series was super awesome regarding world building with the commonwealth and fantastical, but the actual dream sequences were off-putting, too childishly or stubbornly goody two-shoes for my taste. However it all ties in very nicely and the ending is very satisfying. The 2 post books (chronicle of the fallers) were also amazing.
Also read the Great North Road, which was a great stand-alone book, again with some really neat futuristic concepts and subtle warnings about human nature.
Another stand alone book Fallen Dragon is perhaps my favorite of all. Literally everything about this book is awesome.
I had been holding off on starting the mindstar series until he writes more books...I hate being stuck on a cliff hanger for years.
I hope this guy churns out a few more series. If you like space opera's at all, investing in Peter Hamilton is a no-brainer.
As reference, my all-time favorite author is the late Iain M Banks; and I'm currently having a love-hate relationship with Allastair Reynolds revelation space universe