I really like the sound of the whole Vintage Compressor series from Native Instruments. I don't know if the VC 2A actually sound identical to a real Teletronix LA2A but I don't really care as it's the result/sound that counts which is really good, flexible, fast to operate and warmish.
They're actually modeled by Softube and compared to the Cakewalk LA2A, which I was using before, the VC 2A sounds much better and is more flexible; you can better control the sidechain input and can even do parallel compression.
I actually quite like the looks of the VC series as they seem to hint to what they are inspired by rather than having a photo-realistic GUI and they are quite easy to the eye. I ended up buying the whole Vintage Compressor bundle as they all have a similar "sound" to it, which I quite like.