Not really a review - more a bit of observation. I've been playing with this for about a week now, and I've begun to form a base opinion. For creating a single character I still prefer a paper character sheet and pencil; but, when creating a bunch of characters (such as the batch I'm building for convention game) Icons Assembler makes things a lot easier - and faster. It also has the added benefit of producing an attractive - and readable - printed sheet (something that my handwriting does not do).
While playing with app I have found a few bugs - nothing major, just nuisance type stuff - but the developer has been pretty responsive when I've reached out to him.