Ric1987: Have you played The Colonel's Bequest? I beat that one. How would you compare Police Quest to it?
Huh, got me there! This is one of those Sierra games i did not have the pleasure to finish. I've played it for a few minutes only. I don't even remember why i didn't play further, I only remember the interface wasn't like the AGI/SCI ones, but somewhere in between.
Anyhow, the SCI versions tend to be a bit easier, being able to control the character with the mouse, and use icons for actions really helps. With the AGI games You had more actions to do [like 'calibrate the gun' in PQ2], with SCI games such actions weren't required anymore, since You were limited to the icons, no fancy one time verbs.
Still, they are harder than the average.
Hopefully someone else can shed a light on Laura Bow 1.
[edit]
Oh wait, i see from the movies now, the engine is similar to the one from Space Quest 3, and You die in Laura Bow 1 too. So, as i can only estimate, i'd say PQ1 and PQ3 will have a more user friendly interface, making the game easier, but with many more places to get shot/driven over/being beaten to death/failing a booking resulting in death of someone, etc
Bottom line:
If You've survived a Sierra game in the past, and You didn't hate it, i'd say, go ahead.