Well, I'm gunna swim against the tide here
Don't shoot me!
I had the same advise from Marty, but I have always seam sealed my tents, so I decided to do the Tadpole with the supplied sealer (diluted in mineral spirits).
I then took it (without water testing it) for a week in Tasmania. We copped a lot of rain the first few days, as well as hail and wind. By the morning of the second continuous rainy night, a drip appeared above my head (nice way to wake up), and water was getting inside the optional tie-outs where I had apparently also done a bit of a slack job on the sealing.
Since coming back, I've given it the permatex
treatment. That sucker isn't going to leak again.
So, I reckon seal it and if you seam seal it, do a thorough job of it, especially where the rolled seam meets the tarp I think that is where I missed.
Oh, and I recommend the side tie outs, (1 per side) they're great.