My experience with Mini Crawlers is pretty good. I started with a Lennox Kitty Track 600 - 6HP! It was an attempt by Lennox Furnace Co to make a garden tractor in a furnace plant. Interesting project. Overhauled it and sold it.
Next project was a MT-1800 Struck Magnatrac loader/backhoe. 16HP. Overhauled it and learned a lot. Slow but did some work. Machine was a little small with the single chain track to support the backhoe. Putting a load on it in low gear with the weight on it it could break the chain which I did.
I now have moved up to the MH-5000 and what a difference. Loader is very powerful! The 25 HP engine is a big improvement. With added weight it really hooks up. Loader/backhoe is very useful and the power helps. It is slow but can work in tight areas and has more power than any compact utility can deliver in the same hp range. Used prices are attractive. Pretty easy to work on. Support from Struck is great.
A 25 HP compact cannot do the work, will not lift the weight, cannot climb the same grade and cannot work in the same tight spaces. Down sides of the Struck 5000, Slow, fuel tank too small, tears up the grass unless you are careful, going up a grade - breakover is hard to get used too.