At the risk of sounding snotty (not my intent) did you search the forum for Sterling? There are quite a few threads with references to Sterling products by the look of it, I just don't have time right now to read them.

Aside from that, I seem to recall Maine Sail mentioned Sterling products and I gather he generally likes their stuff. Given his attention to detail and knowledge, I would take that as a good recommendation if he says their stuff is good.

I have a Xantrex XAR, which is kind of comparable to some of the the Balmars (one company makes the others, never can remember who makes whose), it's been fine, does it's job quite well though if you need other than a standard profile it can be finicky to set. I'm sure there's better newer ones, hopefully cheaper.

I installed a Pro-Reg D a few weeks ago. I haven't actually started the boat, (exhaust is almost put back together) so all I can comment on is the installation itself.

I found the manual hard quite hard to follow, the information didn't seem to flow logically, I found that creating a sketch, and noting things as I went through the manual was key (the information is really scattered, and there are a lot of possibilities for the connections). In the end i was ok with that because I have a much better understanding of what the connections actually do. I had a few questions for Sterling and they were answered by Charles Sterling himself within 24 hours.

The unit has limited programmability, but I have 4 golf cart batteries, so I'm not overly concerned about that.

The wiring harness is a little short, we ended up mounting it under the sink behind the tall skinny door. The wires were about 1 foot too short, we extended them, but the manual does warn you to keep extensions to a minimum. I emailed the company about this, and got the impression that it might be a bigger issue with certain alternators, so you might want to email the company about yours (we have a Leece Neville, and he said it would be ok).

So now that it's installed, we're happy with it, the price was good, and it included the temperature sensors. Only time will tell how well it works, but when I was researching it I couldn't find too many complaints, so I took that as a good sign.

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Make sure you have a controller (preferably an MPPT) for your solar panels. Depending upon the size of your bank, the state of charge, and the output potential of your solar panels, you can still overcharge. They are not that expensive and well worth it to baby your batteries and give you longer life.