The Frontier is the replacement for the LX, HOWEVER the LX4 was made by John Deere and the Frontier is made by someone else - probably a decent maker, but I don't know which one. The LX series are discontinued and I would ask for the same or lower price on it as the Frontier. However, I would probably choose the LX4 even if it is $50 more. I have an LX6 and while I initially thought I had bought something second best compared to a Woods, but after taking a close look at a Woods brushbull (and, ack, the much cheaper Woods Heritage, which one Woods dealer told me to stay far away from) I feel that the LX is a good quality cutter and worth the price.