I have a COW and have had an okay experience thus far. (I've had it up and running about 2 months now.)A neighbor of mine wants to try his hand with worms and seems, for various reasons, overly concerned about making his own bin. Would those of you more experienced vermiculturists recommend any particular ready-made system above another? The worm inn? worm factory? Or should I just keep encouraging him to drill into a rubbermaid tub?? Thanks!