I've used one.. Later sold it to my friend. That was around 2 yrs back. Still its doing fine. I found the interface a little slower than Nokia non-symbian phones.
Anyways , the camera on E6 is nowhere near to that of k790 without the flash and AF. LG has plastic body an paint starts to wear off easily in 6 months or so . if camera is not important then e6 is the better option . plus u can truly mod ur e6 like hell .