On my WF juggernaut, quickened reconstruct hits for 435 (or just over 900 on crits). In EE content, this is barely enough, and I would say that he is at least semi-reliant on party healing (semi-reliant in that in a party situation you'll tend to aggro more than you would solo, so its not entirely apples-to-apples to compare the toon in a solo vs. party situation).
There is no way a 217pt reconstruct would be worth it on a fleshie arty with construct essence (and this would cost at least 7 ap to achieve). Particularly as you'd end up worse than my juggernaut on positive healing too (wf healer's friend = 80% base healing vs. 75% with construct essence).
Until and unless construct essence is changed to allow increased repairs (and reductions in the positive energy penalty) its complete rubbish on EE.
The counterargument to this is likely to be that a juggernaut is melee whereas a pure arty is ranged, but in that case you're arguing for heal scrolls on the ranged arty imo - they are perfectly usable, and if you max out scroll mastery, you're looking at 262hp before heal amp (so probably over 300hp in typical situations).