I love the GX-100 and use it all the time. I have been wanting a backup for it and this may be it, although would be more inclined to insta-buy at $299.
		
		
	 
$299  !?!?!?!?!   I literally cant believe its 
only  $399  for everything you get 
	
		
	
	
		
		
			
	
Reference manual and parameter guide are up now.
Time to get browsing. £350 is a pretty good deal over here in the UK.
Hmm. No MIDI. Hmmmmmmmmmmmmmmmmmmmmmm,
		
 
		
	 
	
		
	
	
This is  
potentially  a big issue .... all the Midi is done via the USB Port  and the Manual is very unclear if the USB Port is also (a)  a "USB Host"  and (b)  if it is, can it Send and Receive Midi PC and CC.
You 
must have both a + b to use an external Midi FSW Controller to send 
and receive Midi PC and CC ..... however, even 
if it only receives Midi PC and CC that will take care of  +%99.99 of situations / users  ..... more research to be done :)
	
		
	
	
		
		
			The new Ampero II beats this.
		
		
	 
I've spent quite a bit of time messing with the Ampero 2 Stomp.
Hard to compare the Amps  because one aims for  "copies" ... the others high point is it Originals and X-Series .... 
personally I think the Boss  Originals and X-Series Amps are as good as anything out there ..... you just need to use your ear to dial them in .... "standard" settings don't work ..... and ..... micro-adjustments go a long way as they all have a massive amount of range and juice on tap in their Gain and EQ stages.
But Amps %100 aside .... every effect I used/tried on the A2S sounded very  "basic" for want of a better word .... Boss pretty much single handledly created the whole guitar EFX world ... and it shows ... the EFX in the GT / GX and now this "10"  unit are stellar ... the SDE in the GT / GX / 10  alone would cover almost all your delay needs ..... 
unless of course you want/need the more boutique-exotic  delays and verbs of the Strymon / VP4 world.
Hence why it is a stupid no brainer buy even if you 
never even load up or use any of the Amps.
My 2c as always though.