Does the Tech 21 Sansamp PSA 1.1 have enough gain for modern metal tones (think Nevermore, Dream Theater, Metallica, Patera,etc)?

If so,

1.what is the sound of it like,

2.what are its pros and cons

3.and should I use a power amp and cab or something like a tech 21 power engine?

If not, is there a pre amp you would reccomend for the same price as the Tech 21 (£400), and what its pros and cons are.

Will be using with a Washburn X50Q with Seynour Duncans and an Ibanez RG7321