Do weapons have level-dependent unique item stats? When to pick them up?

I am doing a quest line in hope of obtaining a nice unique weapon.

Spoiler below:

The nightingale bow from the thief guild quest line

This is an awesome piece of equipment for my type of character and kind of want to use it indefinitely. My worry is that I am only level 26 and the item will become useless later on in the game. I believe unique item's stats vary depending on character level, which leads me into thinking that I should probably wait until I am a higher level to pick it up. I won't be using smithing of any type to be able to upgrade it.

Is there any way I can make the item viable at later levels or should I just wait till my character is stronger to pick it up?

Solution 1:

It's the eternal struggle:

• Pick it up early, so you got a cool item, which makes leveling easier, which allows you to reach the higher levels faster. But then the item becomes relatively weak.
• Pick it up later, so you got the strongest version, but then you didn't have it for the game before (which thus is harder and/or takes longer).

You should choose beforehand which items you want to have during-leveling, and which items you want to have when max-leveled. My philosophy here is that it's the same as in (real) life: it's not the goal that counts, but the path towards it. So play to have fun, get the item early and enjoy the game.