Most Boogie owners are going to think the Stiletto has too much high end. I played one for a couple of days before I got my Lonestar. Understand that the general characteristic of el34 tubes will result in more high end, more breakup, less bass and a "grittier" overdrive sound. Or, thinner and grainier if you don't like that sort of thing. I A/Bd a couple dual recs yesterday, one with el34s and one with 6l6s and I loved the el34 tone in the rec. But it is a different amp. But you can dial in a pretty close Stiletto/Marshall tone.
I've noticed quite a few Mesa guys putting this amp down and I think it's just because they don't like that tone. A lot of younger players are weaned on "thump, thump" and endless gain and assume that is what a good rock amp is about. That is not available in the Stiletto. However, I think if you gave a lot of these same guys Eddie Van Halen's or Jimmy Page's Superleads they wouldn't like them either. The el34s sound great with a low gain setting (a'la EVH) and respond great with OD pedals like the tubescreamers.
Anyway, if you want a Marshall type tone out of your Boogie, try putting in some el34s. You can get pretty **** close.