@Capper
You know I hadn't thought about the upgraded Centurions, but it occurs to me that most of these machines, while packing advanced components to up their BV, are seriously flawed, and still struggle compared to the newer machines.
Old CN9-A Centurion:
Pros: Standard engine, so is much tougher to kill, even at 2.5 tons of armour less than the Enfield due to the Enfields XL engine.
Cons: It is obsolete by 3070s - too little firepower, too slow (20kph slower than the Enfield).
CN10-B Centurion
Pros: Standard Engine as original, much better firepower (still less than the Enfield)
Cons: Same speed as old machine, 2.5ton less armour than Enfield, has to remain at a stand-off for the Artemis LRM10s to add to the LBX and medium lasers (unlike the Enfield which has no minimum range weapons) Costs the same in BV as the Enfield; ergo less bang for bucks.
CN9-D5 Centurion
Pros: It's fast, I like that, it has more options than the Enfield

RAC5 with Targetting computer...hell yes! You can run away when the RAC5 jams. It's pretty hot direct fire support though, best variant I've seen.
Cons: A Musketeer 45ton Hovertank has the same firepower at almost half the cost (BV 840ish) (the Musketeer has 1 ton less armour and no TC but it carries CASE) and has a similar speed . The D5s XL engine makes it fragile and it still has 2.5tons less armour than the Enfield, it's also slightly more expensive. Almost all of the machines firepower is in one area, and that RAC5 is unreliable if over-used (which it has to do to match an Enfields fire output).
CN9-D9 Centurion
Pros: Upgrade on the D (that's not saying much really), Fun&Funky Plasma Rifle (would rather have the RAC5 TBH) Jump Jets!
Cons: XL Engine and only 8.5tons (equivalent) Standard Armour (2.5tons less than the Enfield), as slow as the original, meh firepower, pointless expensive gyro and at 200 BV more than the Enfield.
Don't get me wrong, I loved the old Centurion/Trebuchet combo, in my minds eye I still see one swivelling to look at a Dropship while it's female pilot says "Welcome to Port Arthur Sir"; but after 3050 they are both showing their age and even overhauled massively they still struggle to out perform the raw firepower of the newer machines; worse still they get these upgrades by loosing their one advantage (the durable Standard engine) and really become underarmed and underarmoured which is why after 3050 I consider them obsolete (all but the D5).
The D5s the best of the bunch IMHO but I'd still rather have 2 Musketeer tanks or one Enfield than the D5 for much the same cost.