Sun Penang is great. I was pretty skeptically initially considering that Asian food in Squirrel Hill tends towards hit or miss. I guess Yelp doesn't consider Malaysian food to be a category?
The service is quite good and attentive. The room is very airy and spacious. Though the restaurant was quite busy, it never felt crowded or too noisy.
Though I think some of the menu items that tend toward Thai are only okay, I think the real gems are their seafood/fish dishes. Basically for those who are willing to be more adventurous, just order the things that you've never heard of before and you won't be disappointed. Portions are quite generous. It's a great place for groups and couples.