Well I've been having some transmission problems lately that simply changing the fluid out didn't help much. After doing some research around online I've pretty much settled between using one of these two products. My mechanic recommended the ATC plus to me which costs about half as much as Auto RX but it seems like Auto RX has more of a following. Does anybody know how these two products compare and whether or not the extra cost of Auto RX is worth it. Also, has anybody tried either of these in a Honda Automatic with good results? Thanks