Although not a fountain pen, the Pentel Energel is likely to become one of my new favourite pens, with its "liquid gel ink" providing a near perfect balance between the qualities of a liquid ink pen and those of a gel pen.
Unlike other liquid ink pens that I have reviewed here in the past, such as the Pilot Hi-Tecpoint and the Uni-ball Vision, the Energel does not bleed through paper. I love writing with any pen that has a needle-point tip, as this pen does, and the 0.5mm size is ideal. (0.4mm or less is not ideal in all situations, since it makes my handwriting so small, and 0.7mm or more is just too wide for me to feel comfortable with and write neatly with.)
The writing experience is effortless and the ink is a deep blue with a slightly greenish tinge compared to other blue pens that I own. The ink feathers very slightly on some papers, but this is hardly noticeable unless you are exceedingly picky.
The pen itself has a stylish, yet business-like and professional, appearance. The grooved hard rubber grip is surprisingly comfortable. Unlike the grips of many pens, it is long and actually covers all parts of my hand that are gripping the pen. Of course, this may not be true for you depending on the size of your hands (mine are probably about average) and the way in which you hold pens. One complaint: the barcode is printed directly on the body of the pen. Again, I much prefer barcodes printed on stickers that can be peeled off. Oh, well...
Overall, however, the needle-tipped, 0.5mm Pentel Energel is an excellent pen. Highly recommended.