Too many great pens already to add anything less than just right at this point . The basic, generic steel nibs are a deterrent to at that price.
I scored an acrylic 88 in brown (I do honestly prefer the ebonite blue/grey and would prefer it more with ebonite, but couldn't turn down the price) with a B nib for $50.
I do have to say, the nibs are kind of boring and uninteresting. I have a B, bought an EF to swap, both are fine, nothing amazing, but what you are getting is a wonderful base for a vintage or alternate nib. I swapped in a TWSBI EF from a 580, and the much broader 580 nib looks way, way better and writes a treat. I can also throw in a #5 gold nib I got from a wing sung 698 or any number of custom #5's. Throw a bock titanium nib in there or a 14k JoWo from FPnibs. The shutoff makes them great traveling pens.
It's a bummer the nib is uninteresting, but it's so easy to swap that it suddenly makes the pen a lot better. It's like a penbbs pen. I bought it and enjoy it thoroughly with a different nib.
The only gripes I have about the 88 acrylic is that it doesn't post very well. it posts, but not super securely, when it easily could've been made to post deeply. Which is a bummer, because that kind of prevents it from being a perfect travel pen. I guess the fantasia works, but I hate threaded post pens with the sole exception of the cross spire.
Does the koloro post securely?