According to Scarpa this new "V" version of the Force that replaces the Force X brings High-performance features to a flat, less aggressive last (defined below), the redesigned Force V features a softer, more compact construction that strikes the perfect balance between all-day comfort and climbing performance. Yes that sums it up!If you require a less aggressive flat lasted shoe (instead of toes pointed down or Asymmetric) for longer term comfort but don't want to give up all the performance features by going to a flat shoe, then this might be a good choice for you. The "Last" of a climbing shoe is the 3-dimensional form on which a shoe is constructed. This Force V has Scarpa's Men’s "FF" – Flat Profile, Slightly Asymmetric last. What that means is a more comfortable rock climbing shoe. Also since not all feet are the same, different models of Scarpa shoes have different lasts. Personally I can't wear a shoe that has a highly Asymmetric last (curved side to side) like the Boostic, Booster S, Furia, or Drago. These 4 models have the FZ- Aggressive, downturned and highly asymmetric last. The new Force V is less Asymmetric like the Instinct (VS's, VSR's, & Lace's) but in a flat shoe. The sole is better Vibram® XS Edge (4mm) rubber as opposed to the base rubber found in entry level shoes . These are working great for me Sport climbing 5.9's.I wear a 43 to a 44 in street shoes depending on the brand. For example in Asics trail running shoes I am a 10.5 or 44. In Scarpa approach shoes I am a 44. The casual Dr Martens shoes I have on now are 43. In these Force V's I tried both the 42.5 and the 43. I settled on the 42.5 for a nice tight performance fit. If I had not taken the advice of a seasoned climber I would have gone with a 43 which would have proven to have been the wrong choice. I went with the tighter shoe. Ideally you do not want any dead space in any of the areas such as the toebox, heal, or the arch. They shouldn't be painful but they should be very tight. As far as sizing, as a general rule in a flat shoe, you only go down .5 to 1.0 in size in a Scarpa... Scarpa says on their site in regards to sizing to "downsize 1/2 to 2 full sizes from street shoe size - *downsizing depends on model, intended use, and personal preference."I hope this information is helpful. The Scarpa Force V is a good shoe and works great for its intended design and purpose!