My god man... It's GREEN! Lol
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I've also got the wallenstein and its a perfect match for my b2920. No need for the hydraulic feed as it self feeds really well. I put full trees that are 4" at the butt in mine regularly and it sucks them through with no trimming or pushing. The bigger opening is what really sold me as i have a lot of gnarly hardwood branches. Since you have time i would look used, they are heavy duty so used tend to be good and you'll save a bit though they seem to sell quickly. If you get one i'de suggest a dolly to move it and hook it up. Here is the one i made. http://www.tractorbynet.com/forums/build-yourself/236156-wallenstein-bx42-chipper-dolly-build.html
Another vote for the Wally BX42 which I run behind my BX25. I did have a DR PTO chipper before that which also worked well, but the Wally handles the 2"-4" material much better. It will self feed larger material better than twiggy stuff but you will have to trim large-crotched branches so they feed in. I would not rule out hydraulic feed if you can swing it. I don't know if the BX25 has sufficient flow to meet the spec's for the hydraulic motor on the BX42R, but I"d sure like to try it. Just couldn't swing the extra dinero's for hydraulic feed.
As you can see from the pic's the Wallenstein is much more substantial in size/weight, though the performance of the DR wasn't that much inferior than the BX42. The DR uses a belt and gear to turn the rotor at higher RPM while the Wally is a direct drive that rotates at PTO speed. The DR unit pictured is an older version as they now offer a top side chute for chip ejection, but it doesn't swivel I believe. Anyway, I think you'll be pleased with a Wallenstein unit for your BX25D to be!
I have a BXM 32 and love it. I do use the shredder for small stuff and it works great. As the others have said, there is no need for hydraulic feed, they feed just fine. I have chipped and shredded a pile of stuff with mine. I have it on a bx23. It is a bit heavy so you need to watch the hills, etc but I would buy it again In a flash !