XV88 Broadside Battlesuit
88mm guns IN SPESSS!
The XV88 Broadside Battlesuit is a modified, heavy version of the XV8 (the original model was more blatant with this, since it just looked like a regular Crisis Suit with BIG GUNS on its back) that trades lightness and maneuverability for two smart missile systems (or plasma rifles) and twin railguns. They provide Tau infantry with anti-armor, and now anti-air, fire support. 6th Edition changed these twin-linked railguns into a Rail Rifle; whilst the rail rifle boasts the fact that it looks freakin' sweet, it's a nerf from the double-barreled railguns. Broadsides can also carry loads of seeker missiles now. A single 3-suit team of Broadsides entrenched in cover is enough to deter all but the heaviest of tanks from getting in range, lest those war machines become overpriced bricks of burning cover. They are as well armored as a Space Marine Terminators, but thanks to the bulk of their weapons and portable generators needed to charge them, Broadsides are one of the few battlesuit models to lack jetpacks. In a similar way to a space marine devastators, Broadside team is usually the first assignment for the freshly promoted Shas'Ui battlesuit pilots, largely for the same reason: as observing the battlefield from the relatively safe distance is a good learning experience, most pilots would definitely find a use for once they move to piloting Crisis, Stealth or more advanced suit.
Since the models for broadsides were once quite similar to standard XV8 which were cheaper than Broadsides (a unit of three costed about 30% more than a single Broadside), a Tau player on a budget could buy a trio of Crisis Suits and then convert the railgun and missiles out of tubing and plasticard. GW figured out that players were doing this, so of course they started manufacturing a different model for Broadsides which naturally costs half of your monthly salary to buy. It looks kick-ass, but we all know Games Workshop never shakes your hand without also giving you the finger!
Forge World heard your prayers, and delivered. Old style Broadsides were brought back, just re-designated it the XV88-2 and swapped the rail rifles on to the arms and the missiles onto the shoulders. Swapping back to the original configuration doesn't take too much kitbashing, either. Sadly, they're gone from the store now.