Magnum's has a nice selection of beers in virtually all categories that a beer enthusiast would want. Cigars and wine aren't bad either, and their new trendy cigar lounge is nice as well.
After several visits I have found the service to be atrocious. For example, today I was there and suspected that my total was slightly off and so I politely requested the receipt. He corrected me by saying I already had it (the credit card receipt) and said that's all he could give me, then followed it up with a nasty look. Since when is it not possible for a customer to receive an itemized receipt to confirm that there were no double charges or mischarges?
Be careful for old or heat damaged product at Magnum's. Over 90% of their product is maintained at a warm room temperature (today it was 100+ degrees and the front door was open), and I've had several bad bottles from this place. If you stick to the refrigerated product you're less likely to get a bad one, and shopping in summer months can be more risky here as well.
If you're in the area Magnum's is worth the stop, but be careful what you buy and expect to be treated poorly.