Most of the rooms were internal (no windows), with only a handful facing the street. We were only there two nights, but still we figured it was worth paying the A$3.30/£1.40 extra for a deluxe room - although small, it was quite a bit bigger than the windowless ones which were tiny. If you were stuck and only wanted a night here it wouldn't be so bad in one of those rooms. The downside of facing the street was the noise from traffic and the surrounding canteens, but it was really only during the day. The television had ESPN, Star Movies and National Geographic as well as local channels. Staff were very helpful and friendly.
The bed was not too bad, a bit saggy in the middle but we've slept on much worse.
The location of the Sun Inns is magnificent. A two minute walk gets you to the Sunway Pyramid (huge shopping centre with an ice-skating rink in the middle of it) and the Sunway Lagoon water theme park. There are numerous canteens and local restaurants all around the hotel, and food courts (plural) in the shopping centre. The hotel is half way between two KTM railway stations, a bit too far for most people to walk to, and a bit closer to an underground station. Buses run regularly into KL (about 15 minutes journey). A 24 hour convenience store is practically next door, as is a laundrette.
Finally, I have got to give a plug for the Indian canteen directly opposite reception. Quite possibly the best and just about cheapest food we've had since arriving.
Given the location, it is very good value and the alternative hotels in the area cost upwards of A$100/£42 per night. Should we be in the area again, I would have no qualms about staying here.