I'm still interested to see if anyone has installed 500w modeling lights in their Acute heads and if this has caused them any problems.
I run a D4r 2400 with a 500w bulb in my main light, and 250ws in the three other. The 500w upgrade is a huge plus when I'm focusing with the Linhof on a f5.6 lens and the dim (compared to DSLR's) groundglass. The cover glass needs to be replaced with a longer one together with the bulb, but there seems to be no heat issues, and I have pushed the back through its paces on fashion shoots from time to time. Absolutely no issues with either pack or heads!
If you plan on a batterypowered AcuteB 600r at some point, you can use one of your Acute2 heads with an adapter and a modeling light change... no need for the AcuteB head. If you plan on upgrading to even faster and more rugged packs, I'd go for ProHeads with the D4, then you can use them in a mixed D4, ProB2 and Pro8 environment in the future.
I also run a Pro7b with the small heads, an AcuteB 600r with small head, and none of the packs or heads ever, ever, ever display problems. My old 7b is now in its eight year, with at least a 150000 pops or more, this is my location pack and the heads have hit the ground pretty hard a lot of times being blown over by wind from a couple of metres up, never a problem except a broken modeling light once!
The compacts are a disaster, I hope they have fixed this with the new Profoto D1's. I used four of these for a couple of years in light studio use, and had:
[blockquote]1 motherboard failure.
5 fuse failures.
3 "issues due to dust" (my studio is like everyone elses, reasonably clean, reasonably industrial.)
1 burnt internal cable
3 modeling light failures
1 flash tube failure[/blockquote]
Stay away from the compacts if you shoot regularly and at a pace is my advice to anyone reading this thread wondering about what way to go in the profoto world, and this is the same I hear from two fellow photographers having used these...
having being an operative word.