Hi Burnsy!
I can't say I'm
experienced since I've only had these for about 3.5 weeks, but I can give you my run-down.
I ordered the Blu kit right away for a lot of the same reasons. Overall, I would say that I'm not disappointed with that device, although it took a week from order to arrival. The biggest drawbacks I have noticed are a)
batteries seem to drop off a bit more quickly due to it being a 90mAH atty; b) there is no manual battery; c) the carts are a little small. The drop off isn't terrible, but it's noticeable compared to some other products. The lack of a manual battery was the biggest downfall to me. I like to be outside and boating, etc, and those manual batteries aren't very good for windy/noisy environments. The cart isn't a huge problem, just have to switch and refill more often.
I've also tried the Magma 510 from volcanoecigs, which I liked. However, my two favorites are the Sidesho and 902 from Modern Vapor. I haven't tried a lot of brands and I'm not trying to steer you to a specific company. But I've found that the Sidesho gave me the smaller-diameter look of the Blu without the dropoff (180mAH battery), the cart is quite a bit bigger, and manual batteries are available. The 510 is a work-horse. Cranks out a ton of vapor, but it is a warmer vapor and since it runs hotter, the flavors don't seem to come through as strongly as they do from the Sidesho. I think the 902 comes out somewhere in the middle. It has more of a throaty, warmer, and voluminous vapor than the Sidesho with the weaker flavor. Similar to the 510, but a little less flavor loss, in my opinion.
Of course, your mileage may vary

So, to answer your question, it depends on how you use it. For heavier smokers switching to
vaping, I would recommend something just a bit bigger. If you're .5-1 pack a day smoker, you may be happy with the Blu. It does have a nice small appearance, which I liked about it. However, if you're active outdoors or go to concerts or whatever, I would recommend something that has a manual battery option. I've found that I actually like the control of a manual battery better anyway, except for when I'm driving.
Any of those vendors can be found here. I'd take a look around before committing

Oh, and all of the above mentioned models come with a PCC charger similar to the Blu. I actually like them a little better since they are "smart" PCC's which means it will cut off when the battery is charged. With the Blu, you have to make sure you remove it once it's charged or it will drain both the battery and the charging pack.
Hope that helps!