They're also weird in their keys - so if the song is in E, you grab the A harmonica, but if the song is in A, then its the D. It's the chord you get when you draw that is the vital one, not blow - I guess that's why the harp players always have more than one. No point turning up t play and discovering the band are in a key you didn't bring! Though I'm not a player, I can see why the serious folk might have a green Bullet or one of the others in their box - doing it with a 58 is much bigger in terms of the physical side. There's an advantage though maybe - that you don't need the amp miked up, or the DI approach - just grab the mic?