Ben - the vestibule is not all that deep, however there was plenty of room for gear inside the tent, with quite a bit to spare. I actually found that there was so much room in there that I kept forgetting where I put stuff. Also - when I set it up for seam sealing I was able lay down in there and my 8 year old laid next to me, with the right pads this could be a 1.5 person tent with a kid (assuming that the gear was kept outside).
The listed weight of the tent is 26 oz - it came shipped at 25.5 oz and after seam sealing, adding zip pulls, 6 Ti Shepherd Hooks, 2 Y Stakes, and replacing the stock cord with Spectra it weighs in at 29.5 oz. I do think that I have an extra 1 oz of Spectra cord at a minimum that I will remove after a few more set-ups.
Set-up took around 2 minutes, very easy and straight forward.
I think there will be a lot of comparisons to the Moment, I want to know the difference, but I think they will be very opposite. I have had this tent perform well in 40 mph winds, there was some flapping, but it held and I would trust it. I'm holding my opinion until I have seen performance in that kind of wind with heavy rain and maybe some light snow. However in fair weather my prediction is that the Lightheart will be a more enjoyable tent than the Moment, the 360 degree views will be very welcoming after a long day on the trail.
I'm pretty happy so far, but I'll just need to use it more... and then get a Moment and use it more.