A few times a year, there's posts asking about this lubrisizer. I don't know how many folks buy them new and how many are like me and get one used as their first one. I thought I'd share what I've learned the past few years using this tool. This is the only lubrisizer (apart from the Lee dies you use on your press) I've ever used.
I am going to cover some general stuff and then get into some specifics, like how to make your own seals, things you can do to cut down on leaks, troubleshooting, etc.
General:
First thing is the position of the lever. Unlike other sizers, this one has the ram lever "sideways". That means you need more width at the bench to mount and operate the tool. There's an optional bench clamp available and I use that instead of bolting it to the bench. The other thing with the sideways lever is you can't "lean into it" very well when raising the arm. For me, the only time this is an issue is if I try to operate the tool with no heat and a stiff lube like Carnauba Red. Overall, the tool is very solid and seems just about indestructible.
The factory made dies only go up to 45-70 cal or so. No 50 cal dies. You can get some custom made. There are fewer folks that do this, though, as compared to Lyman/RCBS. The top punches are threaded and the profiles available are for SAECO boolit profiles. I have used Lyman/RCBS style top punches just fine, though, by "gluing" them in place with a bit of cold lube. I recommend getting some flat top punches (NOE makes them. SAECO ones are hard to find) and these work well on FP and HP boolits. Another challenge is the limited availability of die sizes. Some calibers have quite a few variations (9mm/38 cal - .355, .356, .357, .358, .359, .360 for example) and others have just one (40 cal - .401 only). I have honed by hand a .431 to .433 and a .401 to .403. It akes some work but is doable.