I looked at a lot of different options to lift my truck. I have been in a truck that had the Calmini lift and it just wasn't for me, just too rough riding. It has lots of stuff in the kit but I think that hurts it. I know lots of guys who have had the upper 3rd link break repeatedly.
I priced out OME 2" and it was almost $1100 then I priced Calmini and by the time it was delivered and brokerage etc..was over $1300 I also looked at RRO and a few others and they were all in the $1000+ range, CDN funds, delivered. The cdn $ is strong right now, which hurts it, but 6 months ago when the dollar was 90 cents or less this wouldn't have been an issue. I think the States can manufacture cheaper than Canada can just by sheer population. Look at tire ads from US mags for example.
When I look at what I got and how well I saw it work and how well it road, it was a no brainer for me, plus I also wanted at least 4" of lift. And I can still go bigger with a bl. I don't think you can compare TT solid axle kit to ifs 4 1/2" extreme, it's apples to oranges. I talked to Geoff about TT, he says they're top notch, but his kit is bolt in ifs and needs nothing else, no diffs, no gear swap, no welding.
Don't get me wrong I'm not knocking anyone elses kit, but I think these guys are extremely competitive considering how good of a kit it is. Just my opinion....maybe I'm just stoked about just getting it! Gotta get it in my truck this weekend!