If he can already get to and access the HS machine, why the need to setup and use other services such as LogMeIn? What do they provide other than a login/pw? Not to mention the fact that they are storing your IP (and possibly login) information on their servers... no thanks for me.
Personally, Im not sure how this is any better than having login information of your own. At least that way, you are the only one that has the information.
In any case, the OP did mention that he wants to be able to log into more than 1 machine. Is that easy to setup with said services, if more than 1 machine needs to be addressed on the same internal network?
I guess the other thing for me personally, is the idea that if this was only to setup access to my HA machine(s), I really wouldn't feel all that vulnerable if someone hacked into it. Not to mention the fact that someone hacking into your machine, would practically have to target you specifically. How is said person going to get your IP information? Login and password? What is so great about you and your life that a hacker wants to target you? Otherwise, if it's a random attack, are they going to know/understand how to use Homeseer, CQC, or other automation software that is on said HA machine? If so, the worse thing I see happening is them changing my lighting scenes, or irrigation schedule, etc. It's not as if I would have files stored on this machine that were of extreme importance, other than the configuration files (which I would also have backed up elsewhere).
Maybe it's just me that is naive (and someone please advise if you have had an experience of your own), but I am more worried about my own online shopping and someone stealing my debit/CC information and incurring charges from someone else. And in all reality, it doesn't even have to be online shopping. There was a local fishing tackle supply store, who had their CC information stolen a few months ago. There were probably a couple of hundred local people who had to report fraudulent charges. I guess I just don't see the big risk in having my HA machine hacked, vs. other things to worry about. I have also had similar discussions about WiFi security. I'm not going to have my connection wide open for anyone to access, but why the need for hidden SSID, encryption, MAC filtering, AND firewalls, etc. If a hacker is targeting you, he is going to get in, you only added MAYBE a couple of hours to his work, it's still not impossible to get into. So other than a targeted attack, which you aren't ever going to stop, why would your neighbor or other go through all the work of getting in to check his email? It's a lot easier for someone who is just trying to gain internet access to stop into the local coffee shop, hotel parking lot, or the hundreds of other places that now have free WiFi. That said, my SSID is hidden and I currently have no encryption or other setup. So if any of you wants to sit in my driveway and guess around for a while as to what my SSID is, you would be free to use my internet connection if you figured it out
).