You mean SAGA? I have the Dragonlance SAGA stuff, but I didn't get the impression it did well, especially when it completely disappeared.
It got a BUNCH of supplements out. 9 or 10 rules expansions, several dual statted AD&D/DL5A Adventures (3+, counting the DL Classics 25th Anniversary omnibus),
Don't know about 'good', but maybe it's like D&D 4e, mechanically very strong, but just not what most D&D customers were looking for. Just like when after WFRP3e they went back to something more recognizable by most fans.
Most WFRP fans I know liked the change to 3rd. It does the grim and gritty quite well.
It's just that the wide range of 2nd ed didn't get converted, and had been written by the same company's devs... so there was a limited support for content, and conversions were non-trivial.
As for DL5A, it's robust, but it is tonally so different from AD&D/AD&D2 that few players made the switch. Of the 7p I've run a campaign for, only one didn't like it... and he was the player who liked D&D most - and the only person I've ever complain that DL5A "… is too much like D&D."
If I were to run DL5A's version of DL Classics, I'd want to go through and work out the various spells from AD&D into DL5A terms.
This feels like either a cash grab, just trying to sell you everything again without much difference, not unheard of in the world of Games Workshop... Or they are trying out a new version of WFRP without the danger of loosing their player base (like with 3e FFG). Maybe they are just trying to attract players that don't like the WFRP4e system, but again, I wonder how big that market share is.
Note that WFB (and WH40K, etc) are d6 dice pools, count successes.
unit vs unit melee: one, sometimes two, dice per figure, looking for a formula/table derived value or higher.
A switch to d10's is not a big change.