Currently have the STX/95 set up and am contemplating also getting the BTX eyepiece. Have done a search, but am wondering for those of you who use or have used a BTX, what are the benefits, if any, over just the single eyepiece? Also any cons outside of the weight? Just general insights would help as well. I do have some 12x42 NL's to use along with the spotter. Thanks in advance.