I used it pretty well at my last gig for metal fab with sheet metal, tubing, angles, and bar stock type things. I pull it out occasionally to save IAM files down to a DWG for our engineers to analyze since we only have one seat of inventor and they don't know how to use it. We were offered some deal from our reseller when the company first started up, and they offered us Inventor for the price of Autocad or something, and since it COMES with Autocad, they jumped on it since the Inventor was just lagniappe, so we have Inventor on subscription. I tried to do a test-project in Inventor using an existing job we had already completed a couple years ago. I doing a small job with it now, I'll let you know how I get on. I think Space Gass is better at analysing complete buildings and structures though, the FEA from what I can see in Inventor works fine for single parts but not for larger structures as a whole. There is a lot of potential to create spreadsheet driven parts and members in the future which will speed things up quite a bit too, the best thing is Inventor will let you mix your automated/parametric modeling with your manual modeling and it all plays well together at BOM and detailing time. You need to forget how to model in Acad though, it's completely different but quite intuitive once you get going.
This comes at a small price though which is the learning curve but even without the adaptive/parametric modeling, any changes made are reflected in the drawings and BOM's which is worth the effort at the very least.
The biggest advantage to using Inventor (for us at least) is the ease of changes right through the model and to the drawings, we did a rough model and by moving a work plane or 2 the whole model updated all relevant members and the details automagically, very slick.
Luckily though we have some Inventor experts here so that is a great help, they are mechanical drafters though so their systems of creating models are a bit different but as I learn more and they understand my needs we're getting something going and it's looking good!
I've since had a chance to throw myself in the deep end and it has been a learning experience for sure!
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