I often think that when you have a hammer, every problem looks like a nail. I think this is very much a YMMV issue, depending upon what you do with the tractor.
I have the 4N1 and the LMB, and the 4N1 is probably my most used attachment by a factor of 3-4. Almost none of my projects are light enough for the LMB. A grapple would be nice for brush removal and pruning, but so far, I haven't had to do a lot of it.
I use the 4N1 for dragging (back blade) and leveling (clam shell open) corals, and roads, , applying gravel and mulching materials (false bottom mode, which I find very useful, since I can see exactly where the material is going to go, unlike the LMB or regular bucket), and I use it as a bucket for heavy materials, wet clay, gravel, etc. I have used it to trench down to a broken pipe in wet soil and to make small sloped drainage ditches, and terraces. On my 1445, it is sized such that wet clay soil or granitic gravel is right at the upper end of the lift capabilities. The LMB is too large to handle my soils, but it does great with mulch.
The 4N1 seems to hold about 0.5 cu yard, and the LMB about 1 cu. yard. (At least on the 1445, the 1430 is 54" wide instead of 60, but I don't know how much the height and depth change.)
The one thing that I can't seem to do well is use the blade in a push mode: it seems to catch the soil, the blade digs in, and the tractor suddenly stops. Did I mention that the soil is very very hard here?
Given how hard my 1445 works, and it works really well, I am really impressed at all of the work that gets done by the green machines.
Bob: converting the 1430 to use your existing attachments is easy, except for the trencher, bush hog, and stump grinder which are setup for a lower flow PTO. Then again, a 429 might have a higher output PTO, which would have the same issue....
All the best,
Peter
I have the 4 in 1 and often think I would be further ahead with a standard bucket and maybe a light material bucket plus a grapple. I have not found the PT 4 in 1 to be as versatile as advertised.