i have an sw35 i traded for a trumpet.
its very loud at least i think so for a 35 watt amp. it has a co-ax speaker so it can reproduce many sounds. has a gain control and a +10db gain button for a lot of gain. has head phone jack, and line out, effects loop on back. tone wise its ok, its not bat AT ALL but there just isnt anything special there. I have played other amps with around the same wattage and this one is one of the loudest of them. depending on music you could gig with this. im about to be playing gigs with it in a rock cover band, though i will be using the line out to go into the PA.
never tried THAT hartke but i have tried a hartke before. if it follows its big brothers then it should sound good.
but i would go with the sw35. just because it kicks ass. but i might change my mind if i played that hartke