I love using lump, but the first time you need to be fully prepared to have to load more fuel in. When people talk about a "Full ring" of lump they mean it!! I too thought i had filled the ring only to find i had to add significant fuel 3/4 of the way through my cook.
All that said, the smell of a good lump is worth the hassle. It's just a matter of learning how to pack your charcoal. It's almost a sport!! haha. It really helps if you have some sort of modification to help close some of the gaps in the charcoal grate.