Its awesome. especially with the jumping spiders rune, i found it to be much better than splinters. What i did is use the normal splinters build but switched it out with spiders, obviously. it hits more time so it also crits more times, it really scales well with attack speed too, so anyone having a hard time in inferno with a darts build try using spiders
while spider crit chance increases with crit gear, it unfortunately does not get the bonus crit damage from your crit dmg % items (such as emerald in your weapon)
Yes, the jars proc at 16% of your LOH total or CC chance. Poison Dart proccs at 200%, splinters at 66% each, for 200% total. They are bugged, the 16% is supposed to be on the spider attacks and proccs on the jars instead.