I had most of the Chailly Mahler in singles. Worthwhile hearing certainly, but over time I felt they didn't reach the heights of corresponding recordings I'd had for years, and some of those, years and years. Nothing too drastic in comparing. But enough found in phrasing, dynamics, and playing, that made me reach back for the old standbys.
Would I recommend the Chailly set? Yes, but primarily to new Mahler users, who so often are concerned with quality of sound. Regarding interpretation, later on they can decide if they want something rougher, and more adventurous.