Ok... It's my turn to speak up on this topic since we have both the individual HT's and the Tri-Band.
It really depends on what you are using the radio(s) for.
If your backpacking or want to take one radio on the trip down the hill and cover three bands then the Kenwood Tri Band is the ticket.
If you want the versatility of two great toughly built radios then go with the Vertex 150 and the Alinco DJ-296.
RennMan I don't think it's fair to compare the Kenwood THF6A to buying a Vertex 150 & Alinco DJ-296 as you're missing the 440 band that's included in the Kenwood. That's the 440 band that San Bernardino County ECS uses for their repeater sitting on Frost Peak.
If you're a backpacker then you'll like having everything in one radio and the Kenwood Tri band might be the choice. If you're a person who is limited on a budget and likes the dependability of some well made radios then go for the Vertex & Alinco HT's.
Personally I really like the features of the Vertex 150 and not that excited with the Alinco DJ-296. The DJ-296 has too many features that require extra keystrokes. You can't change the volume or squelch without hitting another button first and seems to be a real pain. I'm currently using one of our VX 150 as a base station and very pleased with it.
I can't say enough about the Kenwood Tri band as far as versatility goes. If you're going down the hill and don't have mobile radios installed in your vehicle then it's the radio to have. Preprogrammed with all 2 meter, 220, 440 local repeaters and some simplex frequencies it gives you the ultimate in versatility in a hand held.
Different strokes for different folks!
Ive been convinced that multi bands are the way to go
I have been looking at the Kenwood THF6A. Yes I'm going against Clint's suggestion 
Just looked this up on the Ham Radio Outlet website. This unit sells for $329.95.
Just for comparison, I looked up my two HTs. The Vertex/Yaesu VX-150 (2M) is $117.95. The Alinco DJ-296 (220MHz) is $169.95.
I know Clint isn't a big fan of HRO, prefering AES. AES prices for the same units are as follows:
TH-F6A $329.99
VX-150 $117.95
DJ-296 $149.99
Food for thought. You could get the 2M and 220 radios, plus accessories, for the cost of the single radio itself.
I thought I wanted a multiband radio. I got convinced otherwise, and I'm glad I went with the radios I have. Of course, everyone is entitled to their own opinion.
Peace