Errr not wishing to go on too much  but I am UK demonstrator for the Eleven Rack..... Errr what can I say it is really very very good. If you have used the Eleven plug-in you will know it does the kind of grungy valve sounds very well. The POD, J-Station and other desktop units are good at super clean and very very distorted however I dont feel they make a very good job of the (popular at the moment) crunchy, Over driven sounds.The interface will all versions (M Powered, LE and HD) is very smooth. ER can act as an LE interface in its own right but works very well along side HD (just take the SPDIF out into the SPDIF in on your interface and route as normal.
The new "stomp box" simulations are great. I like the Green OD (Tubescreamer) model. It all sounds very realistic.Ive got one in my studio and I can really say that so far guitarists I have had in have been blown away by it. Ive even put an add on my site to say leave you monster amps at home. Hoep this helps. If you want any more info or want to come over and have a play do drop me a line.
All the best.

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