_______UPDATED____
Well after copying over my 2 20s monks and playing around with both of them, I have some overall general feedback.
Shinatao=
Overall this PrE is extremely weak and boring to play. It really only has 1 neat feature which is Smite Evil. Due to a 30 second cooldown however it becomes a preety lame attack. Reducing the cooldown to 15seconds would probably be enough to keep this PrE desireable.
Ninja Spy=
The invis/incorporality is fun and usefull. Bearded devils in Shavarath for some reason see through the Invis (tested MANY times). The sneak attack damage is nice. The shortswords however stink to high heaven! This is due mostly to the fact that it prevents the use of Touch of Death (which is the ONLY reason to go dark, dark moves stink). Allow shortswords to use Touch of Death and we "may" see some shortsword monks, otherwise just forget it. Also the bonus ki generation only working while sneaking really limits its usefullness.
Double attack/Offhand Change
Overall I do observe a nerf to my dps and feel that killing mobs is slightly longer. The only benefit of this is sometimes (not all) you can get 2 hits with Touch of Death. This will likely be nerfed (though it shouldnt be as even with it monk dps is still the lowest) which would really stink.
General Enhancements
Monks are EXTREMELY enhancement point starved in this Update, as they really dont have the points to spare on the PrEs without sacrificing allot of cool stuff. Void strike 4 costs 30/80 enhancement points to get, can you believe that?
Monks need some Enhancement point love, some Suggestions=
1. Lower the elemental stances to 1pt for adept, 2 for master, 3 for grandmaster.
2. Lower the Light/Dark junk moves to 1pt (like arcane archer), as people only really want the end move Touch of Death/Rise of Phoneix anyway
Weighted Change
This does actually deserve its own section as monks (due to no GS) have become weighted junkies, with holy of weighted 5% being the standard handwrap for all monks. This change really does stink, it procs noticeably less and I have even seen some resists in Shavarath (cant imagine how bad Epic will be, maybe 50% or less). Unfortuneately I cant spare the feat on my main hafling Dex Dmark monk for stunning fist, unless I make him Shintao and drop dodge from Ninja Spy. But then I will lose my beloved Touch of Death for More unneeded healing as I allready have Dmarks. Honestly with this change +5 holy of weighted 1% handwraps become the standard handwraps. To bad its to late to add icy burst to them.
Overall
Overall this Update is not a great one for monks. No GS handwraps mean you will still be dpsing with a rare lowbie handwrap in raids. The PrEs havent really "fixed" monks too-low dps at all as the dps of monks itself was nerfed. Add to that trying to fit in the Enhancement points for these PrEs means additional loss. Aside from playing around with the free Invis from Ninja Spy, monks in Update 5 will be less fun to play then before.
-------BUGS------
Fire Stance= 100% double attack stance, will ALWAYS get 2 Touch of Death hits, 80% chance of 3. Wind Stance Always gets 1, 80% chance of 2 (which should NOT be changed).