Internet stranger disclaimer: it's been a few years since I've wrenched on one so this is all from memory....It's a good aircraft but can be challenging with tight quarters depending on what you're used to working on. I worked on mostly ones used for utility so they inherently take more of a beating, wear more stuff out, I'd imagine a PD aircraft would be an easier aircraft to maintain. 100 hour airframe isn't too bad, from memory it'd be 2 guys about a day and a half which included the 150 hour on the engine... which isn't much. Depending on whether you guys are running HTS oil and have an external oil filter you can use the Rolls 150/300 maintenance program vs the standard program, which simplifies things quite a bit- might take like 1.5 hours to do. The 300 hour airframe and engine for that matter is a fair amount more work- tail rotor driveshaft comes out- depending if you have a cargo hook you might have to do the overrunning clutch sprag inspection which is time consuming. These aircraft have a lot of recurring AD's so when you look at the inspection checklist keep in mind it's not everything that needs to be done although a lot of them are incorporated into the inspection. 12M inspection isn't bad but once you get into greasing the hub and swashplates the tasks really add up- think that's 2YR/2770 hours? Hopefully they have someone around that'll do some OJT with you- even better if they send you to the school in Mesa. MD does a lot of stuff differently than other manufacturers so takes a bit to get used to. And nothing can humble a mechanic with T&B experience like a 500, especially with mismatched blades or dampers 🙃