This pen just arrived yesterday, so long-term durability is unknown. Pen looks and feels great, looks like an excellent build. Four colors of ink might be overkill, but I'll replace the green with a yellow or orange highlighter refill. A major plus for me is the .7mm pencil - the .5mm leads break much too easily for me. There are several 'brands' similar to this, but most have a .5mm pencil which is useless for me; if you're like me, don't make the mistake of buying one of those.See full review