just picked up a ex demo otto pf450g for 80 bucks that apparently spewed water from the head hense the cheap price. the main seal was missing so a visit to local bearing shop and $6.50 later it's rocking along nicely looking after my aging water in 200 liter barrel. looks good
however in my travels lookin for bits the general opinion seems to be otto have crap after sales service, aftermarket bits aren't available and the pf450 and smaller models i imagine are plagued with problems in the bleed valve area, some shops say 5 in 6. those are high odds.