i currently own a classic with the regular valve. bought it from my sister boyfriend for 300 bucks. never looked back after that. best vaporization possible. tried those cheap ones in head shops from the super vapezilla to the vape pipes. everything has its pros and cons. plain and simple the volcano crushes all. it takes maybe 2 minutes to heat up but your busy preping till then. depending on how much herb is used determines how many bags you get. bags come in 9 foot sections so you can make them as big as needed. and you can watch around with the concentrated cloud of goodness. how convenient bags last forever. i only replace them when i find a pin hole in the bag but that is only caused by continuious folding or want the freshest taste possible. i take the accessories apart once month for a cleaning so nothing gets to sticky. i had the super vapezilla on back order forever glad i cancelled. unlike the vapezilla you can not taste any of the components that the volcano uses while its heated and in use. no plastic taste or rubber taste. thats my experience hope it helps!