Arduino simulator for debugging

i ran arduino simulator www.arduino.com.au.
the free version has 1minute delay on opening sketches , code limited 100 lines.
the pro version has no such limitations licensed. ( strange, thought arduino open source ; )

there seem other simulators available arduinosim, simuino , ... (?)

i don't expect simulate timing behavior identical ( simulating every processor clock cycle in exact real time ) 
but ability debug arduino sketches, looks interesting me, saving lots of upload cycles different serial.print() statements.

who has experience simulators?
do behave identical real arduino in terms of code compilation, memory limitations ?

can interactively / programmatically control inputs ? (simulate real world behavior ?)

can simulate output led / lcd / scope or @ least read pin values , variables content ?

i found forum thread http://arduino.cc/forum/index.php/topic,81945.0.html begin of year, seems version of one.

is worth spending time on examining current state or different ones, regarding expectations?

quote

( simulating every processor clock cycle in exact real time ) 

that require emulator.

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