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I have owned my powerblocks for over seven years now.
[img]C:\Documents and Settings\Niall\My Documents\My Pictures\powerblock.jpg[/img]

My set goes from 5 lbs to 45 lbs with the movement of a pin. they ar small but a tad bulky. because ot the design I cannot do wrist curls and behind the neck tricep extentions are a tad uncomfortable. My dad bought them for himself when he refinanced the house but later discovered that he did not have the drive to use them everyday. Only because I have used them these past years can I safely say that they are worth $239/pair ($59 S/H) which is a sickeningly high price but last I heard most dumbells sell for about a dollar a lb so I guess you would be saving money. so as sad as it sounds price is not a factor. And having dumbells in your bedroom is every bit as helpful to your training as you tink it might be. I work out at home about as much as I do at the gym. my biggest criticism is that I am much stronger now than when I first got them and I am ready for an upgrade. no upgrades are available. Still having a couple bulky dumbells floating around and 1 pair of powerblocks is much nicer than installing a powerblock.

So I give the PowerBlock 5 ninjafaces out of 5 . So go get another job so you can buy your own

Now the better known mainstream adjustable dumbell is the SelectTech dumbells

[img]C:\Documents and Settings\Niall\My Documents\My Pictures\selecttech.jpg[/img]
these things are BULKY. the sides do not get shorter. They are about a third the length of a broomstick and never get shorter. They go up to 52.5 lbs which is 7. 2 lbs more than my dumbells. shipping is free and the company offers payment options unlike PowerBlock. Weights are in 2.5 increments. Not 5 like the powerblock. but the cost is $399.00

I would just save up and buy the powerblock the hard way. they feel much better in my hand and are better balanced. But it will do all it promises. So I give these uncomfortable thngs

4 out of 5 ninjafaces

for more info check out powerblock.com and mercantila.com.