Despite some minor quibbles (and one not-so-minor one about the turret's shape), the up-armoured Challenger 2 is a nice model of the "world's best protected tank" (cue dispute of this claim by fans of the Abrams, Leopard II and Merkava, not to mention Leclerc).
The model is quite well cast and comes in 11 parts: hull, turret, main gun, two track assemblies, two external fuel drums, commander's hatch cover, roof machine gun and two smoke grenade dischargers. There may in fact be a 12th part which I have lost as the turret roof appears to have a locating hole for the fire control system's meteorological sensor but I'll simply replace it with some brass rod.
The good points first. The overall shape and size of the Challenger 2 hull is well captured and the attention to details is nice. All the features specific to the Telic versions such as the frontal ERA package, Dorchester side armour, and Thermal Exhaust Cowls are also there and nicely sculpted. In addition, the roof machine gun is very finely reproduced as is the gun's thermal sleeve. The only thing missing are the dust skirts and rear mud flaps but these would certainly have made casting a real headache and are best added with plasticard if you want them.
Next, the minor quibbles. The general fit of parts is pretty good except for the turret to hull fit because the hole in the hull is too wide and gives a very loose fit. This isn't much of an issue for me since I use rare earth magnets to secure the turrets to the hulls of all my models. As is often the case with metal models, the tracks also need care to get them nice and level. The hull comes with a molded-on camo netting stowed in the left front corner and, while it is nicely sculpted, I prefer to add my own stowage but that's a purely personal preference. Another weak point is the thermal imaging ID panels on the side and rear of the turret which are too small and missing one on the rear face where there should be two on either side instead of a central one.
The Challenger 2's turret roof has some rather complex angles and major companies have produced inaccurate plastic models in their tens of thousands. If you are interested in seeeing how both Dragon and Trumpeter have both managed to get the turrets wrong on their Braille-scale models, check out On the Way's excellent comparison article.
While the possible additions to the hull (dusts skirts and mud flaps) are completely optional and belong to the realm of geekery, I think the turret needs some serious file work to restore some the angles that are missing in order to make it looks rather more like a Challenger 2. It's quite a bit of work but this model can be turned into what I think is a pretty good likeness of a 2003 Challenger 2. You can judge by yourself by having a look at Part 2: Building a better Telic 1 Challenger.