The Callaway X Hot irons are all about more distance. The styling is reminiscent of the Razr X and all the previous generations of Callaway's most forgiving irons, so there are no surprises there.Callaway has kept the proven features from these models in the thru-bore hosel and the Razr weighting on the back of the trailing edge to lower the centre of gravity. This is raised up so that the wide sole is kept to a good size and goes through the turf well, especially from the rough and semi-rough.The main change is the speed frame design that Callaway say will increase ball speed by about 3mph resulting in a distance gain of around 7 yards. This is all well and good but it is the gapping between irons and to the woods and wedges you should pay attention too. Nevertheless, the fact you can take an 8 iron instead of 7 should help your accuracy.When we tested the Callaway X Hot irons, the faces did feel a bit hotter and the feel was still very good. They were also very forgiving and the generous offset hosel will help here. The flight was a little higher than the X Hot Pro irons, , but that is to be expected and will help those high handicappers get the ball up in the air.The X Hot lofts are similar to the Razr X with the wedge at 44 degrees so you will probably need the A Wedge at 49 degrees too. From 6 to 3 iron the shaft length goes up in increments of 0.75 inches instead of 0.5 inches so the 5-iron is 0.5 inches longer than the current model which will also increase the distance from the club as you will have more momentum in the clubhead.The shaft is also a revised option with a lightweight 95 gram Project X steel shaft in stiff and regular instead of the uniflex shafts Callaway have used in the past. This is a good upgrade and the Universal gripe is a nice mid-size and has a very good tread pattern for lining up and grip.Overall the Callaway X Hot are an evolution to the previous model rather than a revolution. The extra oomph from the new face is noticeable and combined with the new shaft options, the Callaway X Hot irons are still one of the best models in the market for game improvers with a little extra to spend.