I like mine a lot, but I do enjoy shooting with the MX maybe more. But for some things I do like AE, and the flash AE off the film plane is great. Metering accuracy is superb. The only thing it really needs is AE memory lock, but that's curiously lacking on all Pentax AE cameras.
I wish the MX had the (non trick) MLU and had the film speed range of the LX.
Complaints that it's too small are odd to me. The MX is smaller and that's one of the reasons I like the MX. But the LX feels fine. My K1000 (a gift - I'd never buy one considering I can get a chrome MX for the price of one) feels like a brick in comparison. (A less well built brick - it's a Chinese made one and frankly feels cheap, but works ok.)