How does this tent compare to the Big Agnes Seedhouse 2? I noticed that it has a similar format with slightly smaller floor space. I am hoping that the rain fly does not require staking like the Seedhouse does.

I have played around with both tents and i decided to go with the Helion. Here is why. the floor seems to be a bit tougher (as mentioned) and so do the poles. I am also not a big fan of the single pole w/ hub configuration on the seedhouse. I find it is harder to pack the single pole compared to the 3 separate ones on the helion. The single pole design on the seedhouse also makes it less stable and less able to withstand harsh winds and rains. I am a bit disappointed with the ring design instead of clips on the helion. this isnt that big of a deal though because you can actually use a bunch of mini wire gate biners as clips. I got some at EMS and it works great. I am also a "happier camper" inside the Helion. it is a tad bit smaller floor space but i was not all that thrilled with the steep slope of the seedhouse side walls. Both tents are VERRY small 2 person tents. if you are a big guy you will not be sharing this tent unless you are spooning and laying against the walls. I highly doubt i could fit 2 big agnes mummy aircore pads in the helion together.. it may be possible in the seedhouse but still very tight. MH was also smart to put adjustable pole grommets on the floor of the tent. this makes it easier to put up and take down while also providing greater stability when tightened. over all the helion is more advanced and better built. both tents are extremely packable (I can get mine with footprint in a small cordura sea to summit compression sack compressed all the way down no problem at all) the hubba hubba is much bulkier and requires a medium sack. it is much roomier though. if you have the extra change I would go with the helion

Thanks Matthew. I understand that vestibules require staking. I guess I should have cited rgmaher2259401's review on the Seedhouse page as part of my original question: "Using the [Seedhouse] rainfly definitely requires staking, so if granite is your thing, you need more tension lengthwise than the poles allow. If you want to stay dry, it has to stay taught, and if anything more than a light rain is expected, you better plan on setting all the guy lines to keep the separation between shell and fly." A.R.M also refers to the same problem. I was hoping the Helion would be different. Any idea? I am interested in the Hubba Hubba as well, but I like the two abovementioned tents better due to their extremely small packablity.

The rain fly does require staking on both tents. For the most part any tent that has a vestibule will require staking. Both tents are good choices. The mountain hardwares pole geometry is a little burlier as well as the floor. I might also look at the MSR Hubba Hubba and the HP version.