I used Lucas Group...

Good: I knocked out 6 interviews in a day, 3 of which I had no interest in whatsoever, which was great training. They prep you pretty well for how to handle an interview. Also got me to look at companies I wouldn't have on my own. And Lucas is free to you.

Bad: The don't match you up with the job of your choice or are best suited for. They support their clients (companies) first and you second; nothing like walking into an interview with 5 people there, and the first question is "so, why do you want to work in construction?? Um......". Heck I (and others) had trouble with them trying to work locations right - I was stationed in LA but wanted to come back East and they were totally unresponsive to that, as the head hunter I was working with had all their clients on the West Coast. I found out who I was interviewing with at their fair about two nights prior, so not much time for research or prep. I blew the last two I did at the fair because I was worn out. Also, all the jobs pay $50-60k - the client companies pay Lucas about 1.5 times your first year salary, so you're not going to see anything higher than $70k... to be honest, it seemed most of the jobs were a better fit for an E-7 than an O-3 or 4.

I ended up working my network to find a consulting job, working for NAVAIR, that pays a base of $85k (bonuses run $10-15K), I work from home 1-2 days a week and they are cool with the reserve thing (Managing Director is a reserve P-3 guy, and the company will make up the difference in pay and keep your benefits if you get recalled). Not in a reserve unit now, but working it - but I'm limiting myself to Del/DC/MD/VA so I don't lose days commuting to the gig. I make enough where I'm doing it because I want to fly and serve, not make money.

So, good experience, but I think the military stars or service academy job fairs are probably a better way to go.

HTH
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