Hydro walk behinds are nice I have a 36 but I did have a 48 belt and the lazer 44 was 125-150% more productive. My dealer does stock blades for it but I am the only one he sells them too so yes it is an oddball size. What is nice is it will go through a 48 inch door where the 48 oddly enough has a few features they get hung up on.
As for hill stability LOL whats that the mower is very short and is also light in the front the wheel base doesn't give you any stability on hills going side to side you can forget about that. My 60 has the vac system and then weights in the front and has for a ztr unheard of stability on hills. But the vac system sticks off the rear and limits the grade you can climb when coming off flat ground. Where as the 44 is like a rocket ship she may not cut side to side and has nearly no control driving down a hill forward but she can climb one like a jet fighter would when gaining altitude.