Dont know where your located but a friend of mine has a new Speeco that he wants to sell.
Probably could get it for $1000 from what hes told me. Looks like this one except his is yellow.
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Tractor Supply sold the Speeco under their CountyLine branding on it in yellow. I know, I own one. Here is a video of a guy using it with his Kubota
and another one as well with a Kubota
They do not sell it anymore at least their website no longer shows it.
https://www.tractorsupply.com/tsc/catalog/log-splitters?ddkey=https:tsc/search/wood+splitter#facet:&facetLimit:&productBeginIndex:0&beginIndex:0&orderBy:&pageView:&minPrice:&maxPrice:&pageSize:&
Here are some pics of it
countyline 3 point log splitter - Google Search
This is the link to the Speeco
SpeeCo Products
I have a JD 990 with 8 gpm flow and it works ok but it is slow but no problem with power in splitting. It also flips down so you can split in vertical mode. You cannot bring it in horizontal mode close to the ground as you can other 3PH splitters. I obtained it because it was included with the tractor when I bought it used with only 75 hrs on the tractor. I found the tractor because I was just looking at woodsplitters on Craig's list one day and up came the 990 with the County Line 3PH splitter.
I also own a Splitfire which the OP showed a picture of their 3PH splitter. Mine is a standalone with a Honda engine which they sell. It has a log lift on it. I would never use another splitter whether 3PH or stand alone other than the Splitfire. It is built like a tank and the two way splitting is exceptional. I understand that the OP is not into speed but any time you use a woodsplitter hooked to a CUT's hydraulics it is going to be naturally slow. So you can still continue to be slow but get the energy advantage from using both directions of the hydraulic cylinder.
Split-Fire has what looks to be 5 different models
Quality Built Canadian 2-Way 3-Point Hitch Log Splitters - Split-Fire which I am guessing have different cylinder sizes. I am like the OP I would like to stand while splitting and not have to bend over. Mine has a log lift which I put on after the fact. I purchased it from Split-Fire. You can purchase the log lifter from them still found here
Custom Options - Split-Fire 2-Way Log Splitters and Wood Chippers and the site says that you can get it for the 3PH model as well. If it were me I would go with the Split-Fire and get the log lifter put on it. I would call them up and talk with them to know what height log lifter you want on it and then go with that option. I don't beleive you could do any better. Another nice feature of the log lifter is that you can use it as a table as you split, back and forth, to put the split pieces on with out having them drop to the ground and then have to pick them up again.
You have my 2 cents worth.
Rob
P.S. I just wanted to add to my post that you will have full force in both directions. I am guessing that the engineering calcs on hydraulic cylinders has some what a different force in each direction but I don't know what that difference is. I have not had any problems with that using my Split-Fire. And if that were the case than why do we only have one hydraulic cylinder on our FEL's and BH's and we use them and get the power out of them when using them in both directions.