The Presonus TubePre is exactly what the name states - a single channel tube based external microphone preamplifier. It has XLR and 1/4 inch inputs and outputs and is not a rackable effect. It also has buttons for phantom power, a pad, a high pass filter (rumble filter) and phase reverse. All the characteristics make it a versatile preamp and it also has a handy good looking meter.
The TubePre is a easy to use and everything is pretty straightforward. It has two knobs for drive and gain, and four buttons for the characteristics I mentioned above. All these options does is make this preamp versatile as you can choose or not to choose each of the options. I never looked too much at the manual as it is easy enough to follow and to get a good sound out of.
The general sound of this preamp is warm and sounds good in a lot of different situations. While it colors the tone a bit, in the right situations this works in a big way. I have used it mostly on bass guitar and electric guitar and it has worked well in both of these applications. It adds a warmth to the sound I can't get with my Digi 002s pre. While this isn't the best tube pre in the world, keeping the price in mind, it sounds really good.
I've had this preamp for about four years. It has worked great in the applications I use it for, and I don't use it all the time because it isn't the best for recording drums or vocals in my opinion, as it colors the sound too much. The price is the best part about this preamp as you can get a nice sounding tube preamp for a real cheap price. The price is what drove me to buy this and I'm glad I did as it has proved to work in the right situations.