I come from Singapore, lived in Sri Lanka, and I swear by this place as being the most authentic Indian curry you will find downtown. Their curry is a cut above the rest; layered and complex. North american curry is dumbed down; this spot hasn't tempered it's recipes [yet] to suit the mild-tongued, and I hope they never will.
Sorry, but if you're looking for a non-spicy butter chicken, don't ruin it for the rest of us by complaining to them about it being too 'hot'. You just need to earn your stripes and understand what curry is. Their butter chicken is deep, with pre-roasted chicken, spiced and aromatic, versus bog-standard tourist recipes that omit the step for a milder flavour. Don't wuss out, order it Asian-level spicy, and embrace curry for what it is.