Pushcart is very good. We ate there twice last week when staying on the cliffs and have been there on previous trips as well. I hesitate to compare it directly to Ivan's since Ivan's seems to compete more with Rockhouse Restaurant, and seems to shoot for a more 'romantic' and 'upscale' feel than I see at Pushcart. Pushcart is casual, comfortable, and seems to specialize in Jamaican dishes (which is one reason we like it) but did not have the wider menu we have seen at Ivan's, Rockhouse, and some others. If Jamaican specialties are what you want then Pushcart is really good and there is live music almost every night.
Enjoy!