There's quite a good choice of lightweight tents available now, much better than 4 or 5 years ago.
All tent choice is about finding a compromise between weight, price, space, robustness (both in terms of not blowing down, and in terms of not wearing out too quickly), ease of pitching, packed size, and doubtless other factors too.
It's probably best to start a separate topic, but questions you should think about include...
Are you likely to want to accommodate a second person?
What sort of weather do you anticipate? Weekend camping, you can just not go if it looks horrid, but if you go off for 2 weeks moving on every day you have to take what comes. You may end up having to pitch the tent in strong wind and/or rain. If the latter, you may wish to avoid inner first pitching and throw-over flysheets.
Is there room for all your pannier in the porch?
Is there room to cook in the porch? (sometimes it's either that or eat/drink cold).
There are often two weights quoted for tents: packed weight and minimum weight. Packed weight includes the tent bag(s), pegs and guys, but may or may not include other things supplied, like spare pole sections, instructions, seam sealant. Minimum weight is the inner tent, outer tent, and poles. It does not include bags, pegs or guylines (often left behind or swapped for different ones).
A lot of the American lightweight tents have inners that have large areas of mesh. Coupled with outers that don't come right to the ground they can be quite cold. Nicer if it's hot though.
If you go too lightweight, you may find yourself taking a groundsheet protector, which rather negates the point of an extra light tent.
FWIW, I use a Hilleberg Akto.
It's much the same in layout as the Laser Competition or Photon, but hasn't been slimmed down to the same extent so it's heavier at 1.5kg. On the other hand I trust it to at least 40-50mph wind, and I can put it up in 30mph nearly as quick as I can in good weather. It also allocates a little more space to the porch, so I can keep 4 Ortliebs and cook under cover at the same time.
To my mind the lighter Lasers have been slimmed down too far, so convenience features like door tie-backs and extra sliders on the zips for top-down unzipping have gone. There's also the 1g pegs that anyone not racing will immediately swap for proper ones.