I believe the consensus is that the ES10 has a slightly stronger Line TBC than the ES15, but it's mostly nitpicky stuff. The ES15 was sold after the ES10, so it might last longer than an ES10. That said, if your Sony Hi8 camcorder has a Line TBC on playback, then I wouldn't add the ES10/15 into the workflow *unless* you observe wiggly stuff. The rule of thumb is only add items to the workflow if needed. Also, some keep the DNR turned on in the Sony Hi8 camcorders and some turn it off. It's probably not a big difference either way. Just throwing it out there to drive you as crazy as everyone else when it comes to these choices.