I have/had a Boss GT-8 and believe it's the best of the lot.
Say had as it's being sold along with Engl 1/2 stack to fund new amp (guy buying it is going back to gigging and is very impressed with it, and he's a pro who has done many records and tours back in the day).
It is extremely well built.
Yes it does amp modelling but so do most and you can turn it off.
You can record but this is a very complicated bit of kit and you are better reading about it or going to their forum than me trying to explain.
It has many distortion effects, some better than others but to my ears the rat and guvnor are great.
It of course has multiple delays,flange,phase,roto,etc.
All effects can be placed in a chain as YOU want. The pedal has multiple wah's along with other assigneable effects like vol. of course.
In fact the thing is a 'spaceship' in a box.
Also, maybe cheesy but actually very neat and works very well, you can set it up to change effects depending upon how much you 'dig' into the strings. So it could be a chorus with lil delay when strumming/picking lightly, then hit a hard powerchord and it can go to a heavy distortion effect with say flange.
It will keep you amused for weeks, trust me.
Anyway, I had an ME and traded it within two days back to the store for the GT-8.
Any more questions I will try to answer :)
Nick