The resin pieces include a new gun barrel with canvas cover, a .30 cal machine gun, new exhaust and new drivers hatch with internal detail. you also get tow rope ends, indicator lenses, probably best replaced with clear or coloured lenses, two water cans and two tarps. all are cast well and are straight replacements for the kit parts.
The etched parts are also very useful and include the missing turret hatch details and a host of other replacements. The rear air intake mesh is particularly well done with a woven mesh. Interestingly the etch is marked "inside the armour" and the instructions mention that this set was originally designed by them but never released.
The instructions are clear with good pictures showing the parts placement on the model.
Overall I think this is a good set to add those essential details to the dragon kit. There are a couple of other update sets out there but this is the first I've seen up close or indeed actually bought. You can find this set and other interesting items at, www.scorpion-miniature-models.co.uk
Very good value and handy if you don't want to add the details from scratch.