Kludgy interface, poor examples
The UI is terrible - it draws the assembly in a sort of bitmap font, but when you tap it, it pops up the entire file in a little edit field that’s about 2 lines high. Nearly impossible to navigate. The example programs do some really dumb things, e.g. naming a dozen sequential addresses for no good reason. There is no documentation on the assembly format, but if it has a DATA statement, the author apparently doesn’t know about it. Yet he added a PST (print string) opcode that does not exist on the 6502. All this plus invasive fulll-screen 30-second ads. No thanks.