If the camera and lenses are working, it's a good deal.
The SRT-101 is a fine mechanical camera, though at it's age (considerably older than you) it will likely need new light seals (an easy DIY effort) and possibly a CLA. The battery it was designed to use (mercury 1.35v #625) is no longer available, but there are alternatives using an easily found hearing aid battery. You want to make sure the shutter works, the film wind is working and smooth, and the meter works. There's a good chance the seller will not have a working battery so you'll need to bring your own if you want to check the meter. Sellers typically assume that the camera they last used 15-20 years ago is still working fine. Another thing, the SRT101 shows the aperture in the viewfinder. It's controlled by a thin cord that moves with the lensmount. The cord sometimes gets broken so make sure that is working. More things to check if you want, but that's the basics.
The XGM is much newer, but I don't know much about it.
As to the lenses, if they are Minolta Rokkor lenses (in good condition), it's a steal. If third party lenses, still probably a good deal. I'm not aware of any 25mm lens for Minolta, so it's probably a 28mm (even better if it's a 24mm). Check to make sure the focus is smooth, the front of the lens does not "wobble", and that here is no haze or mold inside. A few small scratches on the outside of the lens or dust on the inside should not deter you at that price.