I have 2 Mainlands: a mahogany soprano with Mi-Si pickup a, and a Red Cedar Pineapple. I've never played one of their tenors, but I don't see how you could go wrong. Mine are both fantastic, beautiful instruments. They sound great and play very nicely. Before I bought either of mine, I ordered a mahogany soprano as an 18th birthday gift for my niece, and I spent a couple of weeks playing that one too (you know... so the strings would stay in tune for her!). It was also great, and was the reason I decided to get one myself. I definitely plan on adding a couple more before I'm done.
As far as customer service... they are WONDERFUL! Mike installed the pickup for free (well, I had to pay for the pickup, of course!), which surprised me. I was expecting to have to pay SOMETHING for the installation. Also, about a week after I got my pineapple, the bridge popped off in the case one night. It was Sunday morning of Memorial Day weekend. I emailed them, not expecting to hear back before Tuesday after the holiday. Mike emailed me back within an hour and said they'd ship another out first thing Tuesday morning. That was just a freak bad-glue problem, which I've heard of happening with WAY more expensive ukes as well. But I was VERY impressed with how they handled it. They sent a new one with a UPS tag for me to return the old one.
I can't say enough good things about them, really. They are made in China, in (it is widely believed, at least) the same factory as Ohana ukes. They are certainly very similarly built. My mahogany soprano looks identical to an Ohana SK-35, apart from the binding. The fact that you can get a pickup installed, and choose what tuners you want really makes it more appealing than the Ohana (which is also a very nice uke).