Ho! My favourite subject! (anyone who has read my threads know I have pretty bad back problems). The heaviest bass I ever played was probably a recent cocobolo Alembic Series 2, or possibly that 6 string maple Series 2 that was in the Bass Gallery and now belongs to a Forumite. The heaviest bass I've ever picked up (I didn't play it)was probably a Warwick Buzzard Ltd at UK Bass Day. It weighed a ton. I can't begin to imagine how anyone could play it for an entire set, and I used to be pretty strong before my back problems started. Other notables are Aria SB (as above), a Travis Bean I played which felt like 2 Les Pauls bolted together, A Warwick Thumb 6 and Streamer Stage 2 5 (in fact Warwicks as a breed are not the lightest instruments, unless you go for a Streamer Stage 1 or ash-bodied Corvette), a Wal with Wenge facings which felt like the Titanic, my old ESP Jazz which must have weighed in excess of 13 lbs, my original Jaydee which was like having a dining table round your neck (they do vary a lot but mine was HEAVY)....there have been quite a few I guess! Oh, and an old '70s Series 1 which honestly felt like Dracula's coffin with Dracula still in it (ironically I also once played an old '70s Series 1 that was really quite light and comfortable). Guitar wise I''d say Yamaha SGs, much as I love 'em. These days anything over 10lbs is just too heavy for me, and something around 7 or 8 pounds is preferred.