Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works Great for Me!

Several reviews indicate problems with the Portable Buddy when used outdoors. The manual clearly states that it is NOT for outdoor use. It is suitable for use in outdoor enclosures. This does not mean "open air" usage. Its a heater, not a campfire.When used according to the product manual, it functions extremely well. I have found no need for the recommended filter and have had no problems even after prolonged use and long term storage of the heater. I use it regularly with a 20lb refillable bottle. I suspect that the filter might be beneficial for RV systems that are regulated and have gas lines constructed of multiple materials.Bottom line, this heater has served well and continues to do so thru its second winter.