I have been using Advanced Composites Group's VTF261 for almost all of my Pre-preg parts surface material. I also use some material from SHD but that is for backing up the part as it is quite a bit cheaper than VTF.  So after a chat with some of the guys at PRF I decided to try their PRF 464 material this week...  I only got the part out of the mould last night so sorry for the poor photos but it is actually a very good product and although there is some pin holes on the surface it is more due to the breather stack we think than the material. I laid it up like I would with VTF but we think it has to have a perforated release film not the non perf I have been having the best results with VTF.  

Again sorry for the poor camera phone photos I took last night.