I agree - I'm not in love with that locker, but it would not require any gear setups. Gear setups can be expensive, unless you can do them yourself. That's also the only lunchbox locker (as far as I know) that will drop into an LSD carrier.
And there are many advantages of lockers over LSD, and some disadvantages...the OP didn't really state what his intended purpose was (and his profile is very thin), so we're left guessing. I'm just giving him another option.
Even though I have an 8.8 LSD at the moment, I would rather have a rear locker. I don't want clutches in my rear LSD that may wear out/require maintenance/replacement.
If I was going to go to a locker, I'd probably buy a Detroit (which would require gear setup, BTW) for just a little more than the lunchbox locker. I'd love to have a selectable OX or ARB, but they are pricey!
Intentions... have a little fun.
Not looking for serious rock crawling mostly I want not to spin the rear wheels in the snow. I have to access TX sites in the Cascades and it want snow creeping ability. If I wasn't worried about being street able I'd be building a snow buggy.
The Plan ( subject to change for what ever reason ) get lifted to start. I started with an $800 jeep that came with 31's on stock gears and stock suspension. It was in the past sprung over and still has most of the existing mods in place.
Rear CV joint drive shaft.
Extended brake lines.
Dropped transfer case.
Riken raider A/Ts 31x11.5x15
The PO I got it from un did the SOA back to SUA and as far as I can tell there was no High steer mod.
It also came with the Clifford performance mod. ( Cam shaft and intake anifold) and a Borola SS exhaust. Which meant it's been to a machine shop recently. The PO builds race cars. Once I got it going the motor ran great!
already had a decent besttop soft top.
Not bad for $800
To get it running required an new starter, battery and a cat. It had a junky 4 bbl and he threw in a mc 2100. Neither of which worked well. I got lucky and got a new weber 36 outlaw for $250 off CL.
All the gages work after a pc board cleaning.
I had to replace the ignition sw and head light switch.
So for <$1500 it was on the road.
since then I have replaced the heater core, belts, hoses ( including all gas lines and filler hoses.
I have since added an ARB bumper, a fold and go back seat( I have kids ), family style roll cage, full real seat belts.
My goal is to get to a 33 or 35" tire.
Oh yeah back to the plan ( for now ).... SOA the 8.8 in the rear. Then put in the D30 with 4.10's in the front with 3" springs SUA+ shackle lift 1" ( for now ) till I get parts to gather for a high steer mod. Then I'll SOA the front. I Got a trade in the works for a Spartan in the front.
Long term I'd like to get some thing selectable in the back. Since I haven't driven or been in a jeep with any other kind of locker I the rear I really don't know what I want. Use will be 50/50 on/off road. I Live at the foothills of the Cascades so I don't have to go too far. I don't think LS will be my preferred long term choice but it's what I have for now. If an 85$ kit gets it going for the next year or so ( If I even need it? ) Then I'm ok with that.