I like Kuantan very much. I lived in Kuala Lumpur for 4 years before moving over to the east coast, so I can compare the two areas. Additionally, I have visited Penang (1992), Singapore (last time in 1998 other than passing through Changi), Melaka (1999), Negri Sembilan, Alor Setar, Kota Baru, and Kuala Terengganu. I noted the dates on some places to show how long ago I visited, which means I am quite unfamiliar with their current situation.
The east coast was appealing, of course, for the beaches and the proximity to the islands. Now that I live here, I never go back towards KL except for work and, occasionally, for shopping (mostly books). A good bookstore is the one thing that Kuantan lacks relative to KL. Everything else is available that I need or want.
Kuantan has a sufficiently large enough Tamil and Chinese community to provide several choices of restaurants once one tires of Malay food (and I tired quite quickly). Although I also like Kuala Terengganu, it has very few Tamils (only one Tamil restaurant of which I know) and a much smaller Chinese community than Kuantan.
The monsoon season is not that bad. There can be a lot of rain in December and January, but I seldom see flooding. We bought a house in a Malay neighborhood close to the ocean and the downtown, but it has a very good drainage system, and I have never had standing water in my yard unlike a few colleagues who own houses in a more flood-prone area. One just has to be careful when house-hunting.
House prices are going up, but still much cheaper than KL or Penang (from what I read). We bought in 2005 when the minimum price for foreigners was RM150k. I bought a semi-D next to part of the royal family for only RM160k, but it needed some renovation, which brought the price up to RM200k. Double-story links are going for RM190k-380k depending how close to the Sultan's houses (yes, plural) they sit, and also the general location. Similar houses in KL and Penang would run RM500k-1 million.
The new highway between Karak and Kuantan has cut the driving time from 4-5 hours down to 2-3 hours. I often take the bus, which takes exactly 3.5 hours (3 hours on the road, 1/2 hour at Temerloh stop). Use the Pekeliling bus station in KL, not Puduraya.
Not a lot of retired expats here, but I have heard of a Ladies Circle and such. My wife and I stay busy with our jobs (mine paid, hers volunteer), so we don't mix much with expats. That will change once I retire, so I am hoping that more move here in the next 5-10 years.
Teak