For those of us who had invested good money in Boogie's Mark Five: 25, we gave that one our thumbs up. The good people at Mesa Boogie took that success & marched ahead in giving us this refined version here- the Mark Five: 35. In addition to a greater wattage performance, the 35 offers the player some refinements instead of including a new palette of features. For those of you intending to offload your 25, I'd suggest you hold your horses & discover the 35 personally instead of making that rash decision. Keep in mind that the 35 is a refinement of the 25 so it's not a complete overhaul.