Having taken my artificer to Lam, I went and did three solos of the same quest (R4 Reach for the Sky) with different feat and ED layouts to see what I thought of the new tree.
It's... pretty poor.
I at least appreciate the intent the tree had. But it does fall quite a bit flat in execution. Perhaps my artificer is not the intended build. Perhaps I don't have the intended playstyle. Perhaps this just isn't the tree for my character. Or perhaps the intent and concept is flawed.
Artificers have had some defensive mind to them the entire time. This is very clear and honestly, does make them quite different from a lot of other caster classes. Renegade Mastermaker is quite the tree - and this new ED seems like it wants to supplement that. Unfortunately, AC is not very meaningful for most characters, and even an RM doesn't change that much at all. I will be doing a whole-scale build redo to switch into RM on Lam just to fully test, but with the build I have (ranged repeater/runearm) Machrotechnic just doesn't *do* enough.
The build I have benefits quite heavily from Shiradi. Currently it's Shiradi/Shadowdancer with a splash in LD - and I do see that splash changing from LD to Machrotechnic... for one specific reason that's frankly a bit OP. No-fail reflex on a 1 as a 1st tier - this is an ability we have not had at all, and an ability that legitimately powerful, quite probably too powerful.
As to going further, I tested a Shiradi/Machro split (with my T5's in Shiradi, leaving that tree untouched) and it felt... meh. Getting the 3 imbue dice was nifty, getting the speed drive was okay, but there's not much low in the tree that's worth grabbing over spending more points in a different tree higher up. And I don't see that changing if I had more points to spend - this just isn't a great tree to splash into, it needs to basically be main or naught.
I then tested a Machro/Shadowdancer split, leaving out Shiradi entirely. And here I will give credit, I certainly felt the defenses and the HP. But having lost a ton of utility in Shiradi it was much more of a struggle. Perhaps that speaks to the power level of Shiradi more than the power level of Machro, but I still had a ton of things working for me. I was using my runearm a ton more (normally, it's less of a thing as the one I have, dino runearm, doesn't lend well to very ranged) and I was noticing that damage coming quite well (especially with the extra levels). Unfortunately, that damage is not a significant portion of the DPS, and it also forces you into the fray more than this character likes.
In short: Not the tree I was hoping for, but I want to do a whole LR and such and get a decent taste of it as an RM to fully decide.