Is this simliar to Visual Composer? Seems like it takes it to the next step. I've been installing VC for customers for the past few months with much success, but would love to move to something OSS.
Sailing more or less in the same boat here. My weapon of choice has been the SiteOrigin Page Builder but I've found that in many/most cases, I end up doing at least some amount of css and/or even php/js/ajax level code customization, so eager to take Tailor for a test drive.
I've once done a bigger project with Visual Composer and hated every part of it. I bet the WP Community will rejoice if they get a better solution for this.
I'd love to know what the biggest issues you faced were. Easy of use (for both users and developers) is a key goal with this plugin. The decision to have portfolio and ecommerce (i.e., WooCommerce support) as separate free extensions is for this reason; not everyone needs or wants those things cluttering up the main plugin.